Trump's UN Pick Nikki Haley Tells Senate: Israeli Settlements 'Can Hinder Peace'

A Mammoth Task: Scientists Are Reviving Endangered Animals, and Awakening Ethical Questions

The next big thing in cloning is 'de-extinction' - reviving endangered species by creating hybrids that fuse a threatened or extinct animal with one that is thriving.

In the 1960s, the world population of the northern white rhinoceros numbered more than 2,000. At present, there are only seven...