Plus, how to use LED light therapy; cicadas on the way; and how to sleep on a plane. [ARE THESE DRUGS FAKE?]( [VIEW ONLINE]( [ARE THESE DRUGS FAKE?](
This week brought bad news on [marijuana]( and the effects of [too much caffeine](. Also learn about Kate Middleton's [preventative chemotherapy]( and challenge the effectiveness of the wildly popular [LED light therapy](. Plus, a better way to [wash your hair](. [A scientist fills an IV drip](
PHOTOGRAPH BY COLIN CUTHBERT, SCIENCE PHOTO LIBRARY [After cancer diagnosis, what Kate Middleton did](
Britain’s Princess Catherine has been at the center of a media frenzy with her health and her treatment. [What is “preventative chemotherapy”]( Experts explain what we can learn about cancer treatment from the experience. [WHAT WE KNOW]( •
[Innovative new blood tests could detect cancers early](. •
[Colon cancer is rising among young adults. Here are signs to watch for](. [Woman tries on light therapy mask](
PHOTOGRAPH BY TONJE THILESEN [LED light therapy for skin is trendy—but does it work?](
Full-face LED masks like this one can cost up to several thousand U.S. dollars. The application of red light can stimulate collagen production and blood circulation, and even reduce signs of aging. But [light therapy isn’t a panacea for treating any other skin conditions.]( [CAN IT WORK?]( [A close up of a bearded man smoking a joint](
PHOTOGRAPH BY JEENAH MOON, BLOOMBERG/GETTY IMAGES [New concerns rise over marijuana](
For decades, weed was demonized. And now, more and more, decriminalized, even legalized, as strains grow more potent. Science has been slow in determining long-term effects. Recent studies have connected marijuana to psychological and physical illnesses, [even heart disease](. (Pictured above, a man smoking.) [SEE THE LATEST]( •
[Is pain relief from cannabis all in your head]( •
[Science seeks to see if marijuana can fight disease]( [Coffee splashing out of a clear mug](
PHOTOGRAPH BY REBECCA HALE, NATIONAL GEOGRAPHIC [Put that coffee down right now!](
A new study shows a potentially fatal downside of the world’s pick-me-up—and finds surprisingly few benefits. Also, check to see if that lemonade or carbonated water [has caffeine in it](. [GOT THE JITTERS?]( •
[In China, the search for the perfect cup of tea]( •
[Ultra-processed foods hurt your body AND mind]( [Hair washing](
PHOTOGRAPH BY CHRISTOPHE FOUQUIN, REA/REDUX [What does your hair actually need?](
Hair care isn’t one-size-fits-all. We asked dermatologists to explain the science of hair—and [what all those shampoo ingredients really do.]( [CARE FOR YOUR HAIR]( [READ MORE TOP STORIES FROM NAT GEO]( [Pescatarians, sproutarians, and vegans: this illustration breaks down every type of eating](. [Billions of cicadas are about to emerge, creating a once-in-a-lifetime spectacle]( (Free article) [Kombucha and nootropics are all the rage. Do these drinks really work]( [How to sleep soundly on a plane]( (Free article) [SHOP]( [DONATE]( [SUBSCRIBE]( [TRAVEL]( [READ OUR LATEST STORIES](
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