Nature - Moment in the Sun (2024)

Table of Contents
This Week Editorial A global pandemic treaty is in sight: don’t scupper it AlphaFold3 — why did Nature publish it without its code? World View Why role-playing games can spur climate action Pay researchers to spot errors in published papers Research Highlights Reading between the lines: application essays predict university success How cheesemaking could cook up an antidote for alcohol excess Organoids merge to model the blood–brain barrier Africa’s lush tropical forests face a surprising threat: fire News in Focus News Experimental obesity drug packs double punch to reduce weight ‘Quantum internet’ demonstration in cities is most advanced yet Dazzling auroras are just a warm-up as more solar storms are likely, scientists say ‘Orangutan, heal thyself’: First wild animal seen using medicinal plant The US Congress is taking on AI — this computer scientist is helping Cubic millimetre of brain mapped in spectacular detail World’s brightest X-rays: China first in Asia to build next-generation synchrotron Features Egypt is building a $1-billion mega-museum. Will it bring Egyptology home? Harassment of scientists is surging — institutions aren’t sure how to help Books & Arts Book Review Dumping, pillaging and slavery — why exploitation of the high seas must end Recycled sewage, public health and the memory of the world: Books in brief Opinion Obituary Diana Wall obituary: ecologist who foresaw the importance of soil biodiversity Comment Why the European Space Agency should join the US mission to Uranus Correspondence Social-media influence on teen mental health goes beyond just cause and effect Internet use and teen mental health: it’s about more than just screen time Lack of effective intercultural communication is hobbling academia — fix it for research equity Trials that infected people with common colds can inform today’s COVID-19 challenge trials Work Feature How religious scientists balance work and faith Technology Feature DeepLabCut: the motion-tracking tool that went viral Where I Work How my research is putting blue crab on the menu in Croatia Research News & Views Resilience lessons from ancient societies are still relevant today Vaccine-enhancing plant extract could be mass produced in yeast Instability could explain the Sun’s curious cycle The phenomenon of genomic imprinting was discovered 40 years ago Promethium bound: fundamental chemistry of an elusive element finally observed Save the forest to save the tiger — why vegetation conservation matters Genomics reveal unknown mutation-promoting agents at global sites Articles The solar dynamo begins near the surface Measurement of the superfluid fraction of a supersolid by Josephson effect Quantum control of a cat qubit with bit-flip times exceeding ten seconds Lithium tantalate photonic integrated circuits for volume manufacturing Full-colour 3D holographic augmented-reality displays with metasurface waveguides Selenium-alloyed tellurium oxide for amorphous p-channel transistors Giant energy storage and power density negative capacitance superlattices Transcranial volumetric imaging using a conformal ultrasound patch Observation of a promethium complex in solution Boron catalysis in a designer enzyme A meta-analysis on global change drivers and the risk of infectious disease Frequent disturbances enhanced the resilience of past human populations Phylogenomics and the rise of the angiosperms Complexity of avian evolution revealed by family-level genomes Temporal multiplexing of perception and memory codes in IT cortex Airway hillocks are injury-resistant reservoirs of unique plastic stem cells Computationally restoring the potency of a clinical antibody against Omicron Ligand cross-feeding resolves bacterial vitamin B12 auxotrophies Brainendothelial GSDMD activation mediates inflammatory BBB breakdown Periportal macrophages protect against commensal-driven liver inflammation Geographic variation of mutagenic exposures in kidney cancer genomes Concurrent inhibition of oncogenic and wild-type RAS-GTP for cancer therapy Tumour-selective activity of RAS-GTP inhibition in pancreatic cancer Complete biosynthesis of QS-21 in engineered yeast Discovery of potent small-molecule inhibitors of lipoprotein(a) formation Stepwise activation of a metabotropic glutamate receptor Amendments & Corrections Author Correction: Stepwise activation of a metabotropic glutamate receptor Publisher Correction: High carrier mobility along the [111] orientation in Cu2O photoelectrodes Editorial Expression of Concern: Leptin stimulates fatty-acid oxidation by activating AMP-activated protein kinase Focal Point Focal Point on Sustainable Fruit and Functional Components in China FAQs

This Week

  • Editorial

    • A global pandemic treaty is in sight: don’t scupper it

      Millions of people died of COVID-19 because the fundamental principle of equity between nations was ignored during the outbreak. That must not be allowed to happen again.

      Editorial

      Advertisem*nt

    • AlphaFold3 — why did Nature publish it without its code?

      Criticism of our decision to publish AlphaFold3 raises important questions. We welcome readers’ views.

      Editorial

  • World View

    • Why role-playing games can spur climate action

      Solving problems in a safe, collaborative environment can help us think out of the box and build empathy — crucial skills in a warming world.

      • Sam Illingworth

      World View

    • Pay researchers to spot errors in published papers

      Borrowing the idea of ‘bug bounties’ from the technology industry could provide a systematic way to detect and correct the errors that litter the scientific literature.

      • Malte Elson

      World View

  • Research Highlights

    • Reading between the lines: application essays predict university success

      Applicants whose essays had broader ‘semantic content’ tended to achieve higher marks.

      Research Highlight

    • How cheesemaking could cook up an antidote for alcohol excess

      A gel made from a milk protein reduces alcohol levels in the blood of intoxicated mice.

      Research Highlight

    • Organoids merge to model the blood–brain barrier

      Combining a brain organoid with a blood-vessel organoid yields a system similar to a protective mesh in the brain.

      Research Highlight

    • Africa’s lush tropical forests face a surprising threat: fire

      Climate change and deforestation have increased the frequency of blazes in the humid forests of West and Central Africa.

      Research Highlight

Top of page ⤴

News in Focus

  • News

    • Experimental obesity drug packs double punch to reduce weight

      Test of weight-loss candidate in mice shows that there is still room for improvement in a burgeoning field.

      • Asher Mullard

      News

    • ‘Quantum internet’ demonstration in cities is most advanced yet

      Experiments generate quantum entanglement over optical fibres across three real cities, marking progress towards networks that could have revolutionary applications.

      • Davide Castelvecchi

      News

    • Dazzling auroras are just a warm-up as more solar storms are likely, scientists say

      Nature talks to physicists about what to expect in the next few months and beyond as the Sun hits its ‘maximum’.

      • Alexandra Witze

      News Explainer

    • ‘Orangutan, heal thyself’: First wild animal seen using medicinal plant

      The Sumatran orangutan used a plant known to humans for its medicinal qualities.

      • Gayathri Vaidyanathan

      News

    • The US Congress is taking on AI — this computer scientist is helping

      Kiri Wagstaff, who temporarily shelved her academic career to provide advice on federal AI legislation, talks about life inside the halls of power.

      • Nicola Jones

      News Q&A

    • Cubic millimetre of brain mapped in spectacular detail

      Google scientists have modelled a fragment of the human brain at nanoscale resolution, revealing cells with previously undiscovered features.

      • Carissa Wong

      News

    • World’s brightest X-rays: China first in Asia to build next-generation synchrotron

      The US$665-million High Energy Photon Source (HEPS) outside Beijing puts China among only a handful of countries that have fourth-generation synchrotron light sources.

      • Gemma Conroy

      News

  • Features

Top of page ⤴

Books & Arts

  • Book Review

    • Dumping, pillaging and slavery — why exploitation of the high seas must end

      It’s time to sustainably manage the international ocean for marine and human life, says bold investigative book.

      • Diva Amon
      • Juliano Palacios Abrantes

      Book Review

    • Recycled sewage, public health and the memory of the world: Books in brief

      Andrew Robinson reviews five of the best science picks.

      • Andrew Robinson

      Book Review

Top of page ⤴

Opinion

  • Obituary

    • Diana Wall obituary: ecologist who foresaw the importance of soil biodiversity

      Environmental scientist who revealed the crucial role of underground animals in sustainability.

      • Richard D. Bardgett

      Obituary

  • Comment

    • Why the European Space Agency should join the US mission to Uranus

      Without international partnerships, NASA’s groundbreaking mission could fail to be ready in time for its optimal launch window.

      • Olivier Mousis
      • Robin M. Canup

      Comment

  • Correspondence

    • Social-media influence on teen mental health goes beyond just cause and effect

      • Michael A. Spikes

      Correspondence

    • Internet use and teen mental health: it’s about more than just screen time

      • Linxiao Zhang

      Correspondence

    • Lack of effective intercultural communication is hobbling academia — fix it for research equity

      • Shoumit Dey
      • Pooja Sharma

      Correspondence

    • Trials that infected people with common colds can inform today’s COVID-19 challenge trials

      • Jonathan Ewbank

      Correspondence

Top of page ⤴

Work

  • Feature

    • How religious scientists balance work and faith

      Researchers find ways to interweave faith and science, from discussing Ramadan fasts with colleagues to applying religious parables to lab work.

      • Anne Marie Conlon

      Career Feature

  • Technology Feature

    • DeepLabCut: the motion-tracking tool that went viral

      Mackenzie and Alexander Mathis were still early in their careers when their software created a sensation. Now they’re using it to support other young scientists.

      • Jyoti Madhusoodanan

      Collection:

      • NatureTech

      Technology Feature

  • Where I Work

    • How my research is putting blue crab on the menu in Croatia

      Neven Iveša investigates the invasive species in the Adriatic Sea, and works out how to lessen its impact.

      • Jack Leeming

      Where I Work

Top of page ⤴

Research

  • News & Views

    • Resilience lessons from ancient societies are still relevant today

      What lessons can we learn from the factors that govern the resilience of human populations? A large-scale analysis examining ancient societies around the world provides a detailed look at what drives sustainability.

      • John Haldon

      News & Views

    • Vaccine-enhancing plant extract could be mass produced in yeast

      The Chilean soapbark tree is the source of QS-21 — a valuable but hard-to-obtain vaccine additive. Yeast strains engineered to express all components of the QS-21 biosynthetic pathway provide an alternative route to this therapeutic.

      • Ryan Nett

      News & Views

    • Instability could explain the Sun’s curious cycle

      A phenomenon that affects the magnetic fields of rotating bodies could be involved in recurring changes in the Sun’s behaviour, which are related to a periodic flipping of its field. The proposal is a fresh take on this strange effect.

      • Ellen Zweibel

      News & Views

    • The phenomenon of genomic imprinting was discovered 40 years ago

      Some genes carry an ‘imprint’ on either the maternal or the paternal copy, which determines whether or not that copy is expressed. This 1984 discovery changed how scientists think about gene regulation and inheritance.

      • Anne C. Ferguson-Smith
      • Marisa S. Bartolomei

      News & Views

    • Promethium bound: fundamental chemistry of an elusive element finally observed

      The chemistry of promethium, a rare radioactive element, has been clouded in mystery, owing to its scarcity and the difficulties involved in working with it. The synthesis of a complex of promethium plugs this knowledge gap.

      • Kristina O. Kvashnina

      News & Views

    • Save the forest to save the tiger — why vegetation conservation matters

      The Royal Botanic Gardens, Kew, emphasizes the importance of conserving wild plant species, plus a wonderstruck sky-watcher spots a brilliant meteor, in the weekly dip into Nature’s archive.

      News & Views

    • Genomics reveal unknown mutation-promoting agents at global sites

      Genetic sequencing of human kidney cancers worldwide has revealed associations between geographical locations and specific mutation patterns, indicating exposure to known and unknown mutation-promoting agents.

      • Irene Franco
      • Fran Supek

      News & Views

  • Articles

    • The solar dynamo begins near the surface

      Simple analytic estimates and detailed numerical calculationsshow that the solar dynamo begins near the surface, rather than at the much-deepertachocline.

      • Geoffrey M. Vasil
      • Daniel Lecoanet
      • Keith Julien

      Article Open Access

    • Measurement of the superfluid fraction of a supersolid by Josephson effect

      A new method based on the Josephson effect is described, allowing to measure the superfluid fraction of a supersolid, which captures the effect of spatially periodic modulation leading to reduction in the stiffness of superfluids.

      • G. Biagioni
      • N. Antolini
      • G. Modugno

      Article Open Access

    • Quantum control of a cat qubit with bit-flip times exceeding ten seconds

      A type of qubit that has inherent resistance to bit-flip errors has been manipulated with a bit-flip time of more than 10 s without losing that error protection.

      • U. Réglade
      • A. Bocquet
      • Z. Leghtas

      Article

    • Lithium tantalate photonic integrated circuits for volume manufacturing

      Electro-optical photonic integrated circuits based on lithium tantalate perform as well as current state-of-the-art ones using lithium niobate but the materialhas the advantage of existing commercial usesin consumer electronics, easing the problem of scalability.

      • Chengli Wang
      • Zihan Li
      • Tobias J. Kippenberg

      Article Open Access

    • Full-colour 3D holographic augmented-reality displays with metasurface waveguides

      We develop a method for providing high-quality, holographic, three-dimensional augmented-reality images in a small form factor suitable for incorporation in eyeglass-scale wearables, using high-refraction-index glass waveguides with nanoscale metasurfaces, and incorporating artificial intelligence.

      • Manu Gopakumar
      • Gun-Yeal Lee
      • Gordon Wetzstein

      Article Open Access

    • Selenium-alloyed tellurium oxide for amorphous p-channel transistors

      A pioneering design strategy for amorphous p-type semiconductors can be used in high-performance, stable p-channel TFTs and complementary circuits, which may establish viable amorphous p-channel TFT technology and large-areacomplementary electronics in a low-cost manner.

      • Ao Liu
      • Yong-Sung Kim
      • Yong-Young Noh

      Article Open Access

    • Giant energy storage and power density negative capacitance superlattices

      Using a three-pronged approach—spanning field-drivennegative capacitance stabilization to increase intrinsicenergy storage,antiferroelectric superlattice engineering to increase total energy storage, and conformal three-dimensionaldeposition to increase areal energy storage density — very high electrostatic energy storage density and power density are reported in HfO2–ZrO2-based thin film microcapacitors integrated into silicon.

      • Suraj S. Cheema
      • Nirmaan Shanker
      • Sayeef Salahuddin

      Article

    • Transcranial volumetric imaging using a conformal ultrasound patch

      A conformal ultrasound patch can be used for hands-free volumetric imaging and continuous monitoring of cerebral blood flow

      • Sai Zhou
      • Xiaoxiang Gao
      • Sheng Xu

      Article

    • Observation of a promethium complex in solution

      Stable chelation of the 147Pm radionuclide in aqueous solution by the newly synthesized organic diglycolamide ligand is demonstrated and the resulting complex studied, showing accelerated shortening of bonds at the beginning of the lanthanide series.

      • Darren M. Driscoll
      • Frankie D. White
      • Alexander S. Ivanov

      Article Open Access

    • Boron catalysis in a designer enzyme

      A completely genetically encoded boronic-acid-containing designer enzyme was created and characterized using X-ray crystallography, high-resolution mass spectrometry and 11B NMR spectroscopy, allowing chemistry that is unknown in nature and currently not possible with small-molecule catalysts.

      • Lars Longwitz
      • Reuben B. Leveson-Gower
      • Gerard Roelfes

      Article

    • A meta-analysis on global change drivers and the risk of infectious disease

      Reducing greenhouse gas emissions, managing ecosystem health, and preventing biological invasions and biodiversity loss could help to reduce the burden of plant, animal and human diseases, especially when coupled with improvements to social and economic determinants of health.

      • Michael B. Mahon
      • Alexandra Sack
      • Jason R. Rohr

      Focus:

      • Climate Change and Human Health

      Article

    • Frequent disturbances enhanced the resilience of past human populations

      Analysis of population decline shows that frequent disturbances enhance a population’s capacity to resist and recover from downturns and that trade-offs exist when adopting new or alternative land-use strategies.

      • Philip Riris
      • Fabio Silva
      • Xiaolin Ren

      Article Open Access

    • Phylogenomics and the rise of the angiosperms

      Phylogenomic analysis of 7,923 angiosperm species using a standardized set of 353 nuclear genes produced an angiosperm tree of life datedwith 200 fossil calibrations, providing key insights into evolutionary relationshipsand diversification.

      • Alexandre R. Zuntini
      • Tom Carruthers
      • William J. Baker

      Article Open Access

    • Complexity of avian evolution revealed by family-level genomes

      Using intergenic regions and coalescent methods to analyse the genomes of 363 bird species, the authors present a well-supported tree confirming that Neoaves experienced rapid radiation at or near the Cretaceous–Palaeogene boundary.

      • Josefin Stiller
      • Shaohong Feng
      • Guojie Zhang

      Article Open Access

    • Temporal multiplexing of perception and memory codes in IT cortex

      We examined how familiar faces are encoded in inferotemporal, perirhinal and temporal pole face patches, and found that relative response magnitude to familiar versus unfamiliar faces was not a stable indicator of familiarity in any patch.

      • Liang She
      • Marcus K. Benna
      • Doris Y. Tsao

      Article Open Access

    • Airway hillocks are injury-resistant reservoirs of unique plastic stem cells

      In the lungs, recently identifiedepithelial structures known as hillocks can act as injury-resistant reservoirs of stem cells.

      • Brian Lin
      • Viral S. Shah
      • Jayaraj Rajagopal

      Article

    • Computationally restoring the potency of a clinical antibody against Omicron

      By demonstrating a computational approach to restore the clinical efficacy of a COVID-19 antibody, the potential to rapidly update clinical antibodies is explored.

      • Thomas A. Desautels
      • Kathryn T. Arrildt
      • Daniel M. Faissol

      Article Open Access

    • Ligand cross-feeding resolves bacterial vitamin B12 auxotrophies

      Two species of auxotrophic marine bacteria are shown to share precursors to synthesize the essential cofactor vitamin B12, and such ligand cross-feeding may be a common phenomenon in the ocean and other ecosystems.

      • Gerrit Wienhausen
      • Cristina Moraru
      • Meinhard Simon

      Article

    • Brainendothelial GSDMD activation mediates inflammatory BBB breakdown

      Lipopolysaccharide-induced breakdown of the blood–brain barrier requires activation of GSDMD-mediated plasma membrane permeabilization and pyroptosis in brain endothelial cells.

      • Chao Wei
      • Wei Jiang
      • Feng Shao

      Article

    • Periportal macrophages protect against commensal-driven liver inflammation

      A subset of Macro-positive macrophages is identified to have immunosuppressive functions in the periportal vein zones of the liver to mediate excessive inflammation, and their effects depend on commensal gut bacteria.

      • Yu Miyamoto
      • Junichi Kikuta
      • Masaru Ishii

      Article

    • Geographic variation of mutagenic exposures in kidney cancer genomes

      Whole-genome sequencing of 962 clear cell renal cell carcinomas from 11 countries shows geographic variations in somatic mutation profiles, including a mutational signature of unknown cause in 70% of cases from Japan.

      • Sergey Senkin
      • Sarah Moody
      • Paul Brennan

      Article Open Access

    • Concurrent inhibition of oncogenic and wild-type RAS-GTP for cancer therapy

      RMC-7977, a compound that exhibits potent inhibition of the active states of mutant and wild-typeKRAS, NRAS and HRAS variants has a strong anti-tumour effect on RAS-addicted tumours and is well toleratedin preclinical models.

      • Matthew Holderfield
      • Bianca J. Lee
      • Mallika Singh

      Article Open Access

    • Tumour-selective activity of RAS-GTP inhibition in pancreatic cancer

      RMC-7977, a multi-selective RAS(ON) inhibitor,exhibits potent tumour-selective activity in multiple pre-clinical models of pancreatic ductal adenocarcinoma through a combination of pharmacology and oncogene dependence.

      • Urszula N. Wasko
      • Jingjing Jiang
      • Kenneth P. Olive

      Article Open Access

    • Complete biosynthesis of QS-21 in engineered yeast

      QS-21—an FDA-approved vaccine adjuvant—and several structural analogues of QS-21 can be synthesized in engineered yeast strains, and this process is much less laborious compared with the conventional mode of extraction from the Chilean soapbark tree.

      • Yuzhong Liu
      • Xixi Zhao
      • Jay D. Keasling

      Article Open Access

    • Discovery of potent small-molecule inhibitors of lipoprotein(a) formation

      Biochemical screening and optimization identify small molecules that inhibit the formation of lipoprotein(a), and these inhibitors reduce the levels of Lp(a) in several animal models, suggesting that they could provide a therapeutic option in humans.

      • Nuria Diaz
      • Carlos Perez
      • Laura F. Michael

      Article Open Access

    • Stepwise activation of a metabotropic glutamate receptor

      We propose a model for a sequential, multistep activation mechanism of metabotropic glutamate receptor subtype 5, including a series of structures in lipid nanodiscs, from inactive to fully active, with agonist-bound intermediate states.

      • Kaavya Krishna Kumar
      • Haoqing Wang
      • Brian K. Kobilka

      Article

Top of page ⤴

Amendments & Corrections

  • Author Correction: Stepwise activation of a metabotropic glutamate receptor

    • Kaavya Krishna Kumar
    • Haoqing Wang
    • Brian K. Kobilka

    Author Correction

  • Publisher Correction: High carrier mobility along the [111] orientation in Cu2O photoelectrodes

    • Linfeng Pan
    • Linjie Dai
    • Samuel D. Stranks

    Publisher Correction Open Access

  • Editorial Expression of Concern: Leptin stimulates fatty-acid oxidation by activating AMP-activated protein kinase

    • Yasuhiko Minokoshi
    • Young-Bum Kim
    • Barbara B. Kahn

    Editorial Expression of Concern

Top of page ⤴

Focal Point

  • Focal Point on Sustainable Fruit and Functional Components in China

    China is one of the world’s major producers of fruit. Its food and agricultural scientists are leading a drive to develop sustainable methods to produce and process fruit.

    Focal Point

Top of page ⤴
Nature - Moment in the Sun (2024)

FAQs

Is 20 minutes in the sun enough to get a tan? ›

It depends on your skin type. Those with fair skin likely need a bit longer, while people with darker skin may only require 15-20 minutes daily. Start slow and gently build UV skin tolerance over multiple sessions for the best color development.

Is 10 minutes a day in the sun enough to tan? ›

Yes, if you have fair to light skin.

If you have light skin or very light skin, 10 to 30 minutes in the sun is a perfect amount of time for a tan. Much longer than that, and you could start to develop a sunburn.

Can I get tan in 15 minutes? ›

You may burn or tan in as little as 10 minutes if you're not wearing sunscreen with SPF (sun protection factor). Most people will tan within a few hours. Sometimes, you will not see a tan right away. In response to sun exposure, the skin produces melanin , which can take time.

Can you still get tan at 6pm? ›

But it's likely you'll get one if you're outside, sans protection for 2 hours between 4-6 p.m. Just because it's “ginger golden hour” doesn't mean it's OK to skip the sunscreen.

What is the best time to sit in the sun for vitamin D? ›

Abstract. To get an optimal vitamin D supplement from the sun at a minimal risk of getting cutaneous malignant melanoma (CMM), the best time of sun exposure is noon.

How to get a dark tan in one day? ›

How to tan quickly in the sun?
  1. Tip 1: Use sunscreen.
  2. Tip 2: Avoid lying down flat.
  3. Tip 3: Bring the right things with you.
  4. Tip 4: Try an accelerator tanning lotion.
  5. Tip 5: Try out self tanners.
Sep 28, 2023

Does a natural tan get darker overnight? ›

Once skin is exposed to UV radiation, it increases the production of melanin in an attempt to protect the skin from further damage. Melanin is the same pigment that colors your hair, eyes, and skin. The increase in melanin may cause your skin tone to darken over the next 48 hours.

What is the optimal time in sun for tan? ›

If you want to tan in the least harmful way, we recommend you to get in the sun for 20 minutes every 3 hours. Use the morning sun before 10 o'clock, and afternoon sun, after 4 o'clock. This way you will get a perfect and healthy tan!

Can you tan when it's cloudy? ›

A cloudy sky may not seem like the best choice for tanning, but it is still possible to tan! According to research and studies, around 90% of UV rays penetrate clouds, therefore reaching your skin. Even if you can't feel the sun on your skin, the UV rays that lead to tanning are still present.

How to tan quicker? ›

Here's what you can do to tan faster, while still staying safe in the sun.
  1. Avoid sunbeds. At all costs, this isn't a drill! ...
  2. Take care of your skin. If you take care of your skin, it'll take care of you. ...
  3. Exfoliate the night before. ...
  4. Moisturise. ...
  5. The right sun cream. ...
  6. The right diet. ...
  7. Don't overexpose.

How to tan instead of burn? ›

Don't forget to:
  1. Reapply sunscreen every 2 hours and after going in water.
  2. Apply SPF to your scalp, the tops of your feet, ears, and other places you can easily miss.
  3. Roll over frequently so you tan evenly without burning.
  4. Drink plenty of water, wear a hat, and protect your eyes by wearing sunglasses.
Jan 2, 2020

Do you tan in the shade? ›

Can I tan or burn in the shade? It is still possible to tan or burn in the shade because you don't have to be in direct and full sunshine to get a tan. As long as UV light is reflecting on to you, then your skin is absorbing it – snow and sand, in particular both strongly reflect the rays of the sun.

Will I tan with factor 50? ›

With SPF 50, 2% of UV rays are able to penetrate the skin. That's how you're still able to get a tan even with a high SPF. So in order to prevent yourself from sun damage, you need to reapply at least every two hours.

Does sunscreen stop tanning? ›

Sunscreen does not prevent you from tanning, because it does not protect your skin from 100% of UVA radiation. Applying SPF 30+ protects you from 97% of UV rays, while SPF 50+ from 98%. This means that some rays will still reach your skin despite wearing sunscreen, so it will not prevent tanning completely.

Can you tan through a window? ›

The simple answer is yes, you can both tan and burn through windows. A window does filter out some UV rays but not all of them, leading to the misconception that they offer complete protection. Windows only provide partial shielding, leaving individuals vulnerable to sun damage through glass.

Is it OK to be in the sun for 20 minutes without sunscreen? ›

Some dermatologists believe that, as long as you don't have complications with usual sun exposure, you can sunbathe without sunscreen up to 20 minutes each day . To reduce the risk of sunburn, it may be best to stick to 5 to 10 minutes.

Is 20 minutes in the sun too much? ›

Twenty minutes is the average amount of time that people can stay out in the sun without causing damage to the skin and increasing the risk of skin cancer.

How long will it take to tan in UV 4? ›

On average , it can take anywhere from 10 - 20 minutes for fair skin to tan in UV4 , while it may only take 5 - 10 minutes for darker skin tones . It is important to always follow the recommended tanning guidelines and to never overexpose your skin to UV4 rays .

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