Space Imaging/Getty Images, Globe Staff

The amazing expanding Pentagon

After a decade of “mission creep,” the Department of Defense has become America’s default tool for dealing with the world. Where does this leave the next president?By Thanassis Cambanis

Brainiac

The tacos of history

The mysterious history of tacos, how markets do moral damage, and the fish upstairs.

Uncommon Knowledge

Reasons to avoid scoundrels

Hanging out with immoral people changes your standards; hierarchy makes for better teams; responding to sexism with racism; mixed feelings are good for you; and stress increases trust.

The Word

Ideas | The Word

A golden age of proverbs

Though we think of proverbs as hoary old chestnuts, a new book argues that we’re minting new ones all the time.

Uncommon Knowledge

Uncommon Knowledge

Figure skating: more corrupt than ever?

Faith boosts willpower; men are quieter in a diverse group; high pressure leads to generic advice; and posing to show your electable side.