On this episode, Mark and the crew are back at Grand Cayman Island… and on this adventure they're going night diving to ...

Sputnik skies to analysis of interstellar visitors, scientists are rethinking how and where to look for physical traces of ...

Consciousness could be a fundamental part of reality, like gravity or matter, according to this controversial theory.

A popular idea suggests a link between big brains and a rich social life, but octopuses don't fit the pattern, which suggests ...