Now another climate change story, this one reaching back to the earliest origins of human history. Tonight's NOVA explores a provocative new theory about those possible connections. Here's an excerpt.

how “man’s best friend” changed human society and how we in turn have radically transformed dogs. From the tiniest Chihuahua to the powerful and massive English Mastiff, modern domesticated ...

proves the events of 536 triggered massive climate change and changed the course of human history. The scientists behind the report, which reconstructed temperature ranges from the era using tree ...

When they put that uniquely human variant into mice, it subtly changed the vocalizations made by babies and adult males. (SOUNDBITE OF HIGH-PITCHED MOUSE SQUEAKING) GREENFIELDBOYCE: Jarvis says ...