Children and adults alike kept their eyes fixed on a glass tank as aquarist Mark Olson prodded a small octopus out of hiding. After a few gentle prompts, the octopus shot out from under a rock and ...

Shimmering water intrigued scientists at a spot off the coast of California in 2018, where they made a staggering discovery: Far below the surface, a legion of an estimated 20,000 deep-sea octopuses ...