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Daniel Casanave
Porfolio. Credit: Nick Rochowski
© Simon Buckley
Work in Progress by Jonathan Zawada
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)
Azarra Amoy. Photo credit: Edwin Ingram
Illustration by [Abbey Lossing](https://www.abbeylossing.com) for Creative Boom. © Creative Boom
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