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© Jeremy Snell. All images courtesy of the artist and Setanta Books
Image courtesy of Rens Original
© Simon Buckley
Fireworks for Sleepwalking in the Forbidden City in Liuyang, China in 2020. Photo by Lin Yi, courtesy Cai Studio
Anil Sebastian
Not all viruses lead to global pandemics. Some have evolved to our benefit. An ancient virus called HERV-K may protect human embryos from other viruses, according to Joanna Wysocka, a professor of both chemical and systems biology and of developmental biology at Stanford University. When an embryo reaches the eight-cell stage (as projected at left), HERV-K is activated and may nudge the cells to build proteins that shield them from infection. It turns off when the embryo implants in the uterus. Ancient viruses make up nearly 8 percent of human DNA, with HERV-K joining an ancestor's genome more than 30 million years ago. Scientists like Wysocka are continuing to untangle how viruses have become a part of us. (Craig Cutler/National Geographic)
The Girls of Guanabara
The Last Supper by Musketon
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