Following a trail of fossils found in all the wrong places–beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic–NOVA uncovers the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.
We can now edit the human genome with a tool called CRISPR. But how far should we go?
Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
Goddess, demon, house pet? What does science say about the human relationship with cats?
