Science

'Clone sisters' of Dolly the sheep are alive and kicking
Dolly, the first cloned mammal, had early arthritis and died young, raising concerns that clones age prematurely. But a study confirms the sheep's four sister clones are healthy and aging well.
The reason your feed became an echo chamber -- and what to do about it
It often feels as if social media serves less as a bridge than an echo chamber, with algorithms that feed us information we already know and like. So, how do you break that loop? We ask some experts.
An archaeological mystery in Ghana: Why didn't past droughts spell famine?
A terrible drought hit Ghana in the 1400s, far worse than today's conditions. Yet people had enough to eat, while today they go hungry. What changed? In a word, colonialism, a new study suggests.