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Every human life begins as a cluster of cells that soon face critical decisions. Within weeks, those cells must choose their fates – some forming the nervous system, others the gut, heart, or muscle.

For decades, scientists knew the outlines of…

Astronomers have found that Saturn’s moon, Enceladus, is spewing out copious amounts of complex organic molecules, suggesting it’s an even more promising place to look for extraterrestrial life than previously thought.

As detailed in a…