You’ve probably used and discarded hundreds of pencils in your life so far. Put your knowledge to the test — and learn some cocktail party trivia in the process.

Melissa Fleming of the UN’s Refugee Agency shares some ways to help refugees right now.

Dave Troy crunches data to see places not as neighborhoods but as relationships between people.

The history of aerial bombing | ideas.ted.com

In 150 years, aerial bombing has almost never achieved its strategic goal: to kill morale. A study in the paradoxes of technological dystopianism.

We asked an international group of 12 artists, designers, photographers and activists to provide one image that encapsulates what inequality means to them — and to explain their selection. The results are stunning and thought-provoking. Warning: some of them might make you cry.

Over the years, social change in the public sphere has led to abrupt shifts in private attitudes about sex. Call it a different kind of sex change.