Researchers at Stanford University have found a way to move muscles with pulses of light, reports Technology Review's Erika Jonietz. The study, published in Nature Medicine, describes what the researchers are calling "optogenetics" — a technology which uses light-sensitive proteins from a single-celled alga placed on the nerve and pulses of light to trigger muscle movement, Jonietz says.

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23andMe's Anne Wojcicki ponders DNA and what it means to be human in a New York Times essay.

A new estimate places the last universal common ancestor to life on Earth as living 3.9 billion years ago, Inverse reports.

In PNAS this week: retinitis pigmentosa gene therapy, role of microbiome in growth stunting, and more.

Bloomberg reports that researchers and drug companies are modeling anti-obesity treatments after the rare genetic condition essential fructosuria.