This article originally appeared on Undark. When someone close to you develops signs of mental illness, you spring into detective mode. You ask questions, but the answers seem vague and incomplete.

Deeply entrenched conflicts are dividing the world – and many people's social circles. The violence in Israel and Gaza is triggering often overheated discussions among friends, family and strangers.

A new study of brain activity patterns in people doing a memory task finds that the way we make inferences—finding hidden connections between different experiences—changes dramatically as we age. The ...