These are the signs to look for.
|  | Monday, July 31, 2023 | | | | |
 | PHOTOGRAPH BY SCIENCE PHOTO LIBRARY
| | The rise of colorectal cancer in younger people is a riddle without an easy answer.
The first inclination is to look at higher obesity, diet, and physical activity—but those may not be the biggest reasons.
Experts, already recommending earlier and more widespread screenings, are looking at genetics and environmental factors, too (above, cancer of the ascending colon). But what, exactly, are the clues?
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 | | PHOTOGRAPH BY GEORGE GRANTHAM BAIN COLLECTION, LIBRARY OF CONGRESS | | | |
 | | PHOTOGRAPH BY RIVER CLAURE | | | In memory of The Little Prince author: What if one of history’s most widely read children’s books took place not in the Sahara desert but in the Andes Mountains? And what if the main character was a dark-haired Andean child? This Nat Geo Explorer and photographer lets us imagine. (Above, the protagonist walks through a metaphorical rose garden.) | | | |
 | | PHOTOGRAPH BY HAROLD M. LAMBERT, GETTY IMAGES | | | Oh, the good 'ol days: Nostalgia goes beyond a warm fuzzy feeling of past memories—your brain is actually hardwired to crave it. “Consuming nostalgic media of all types gives us a way of thinking about who we are, and helps us make sense of our purpose in life,” Nat Geo reports. (Above, a family watches baseball in 1966.) | | | |
 | | PHOTOGRAPH BY EVELYN FREJA, THE NEW YORK TIMES/REDUX | | | Get the details right: We were curious how acclaimed director Christopher Nolan approached creating the blockbuster Oppenheimer—so we asked him. (Above, the 70-millimeter IMAX film on which the film was shot, featuring actor Cillian Murphy.) | | | |
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