True blue is one of nature's rarest tricks, and the animals that pull it off range from tiny ocean drifters that steal venom to brilliant rainforest giants that shimmer like gemstones in flight.

The Harvard astrophysicist has devoted years—and thousands of interviews—to the idea that mysterious objects streaking ...

The “Wow!” signal is one of our best pieces of evidence for aliens, but researchers are building a compelling case for a more ...