Weather and WarA new study suggests El Niño may be to blame for nearly a quarter of recent global conflicts.
The Persistence of HateGerman communities that murdered Jews in the Middle Ages were more likely to support the Nazis 600 years later.
When Does Amnio Make Sense?A new study suggests the old rule—test women over 35—isn't just wrong, it's backward.
How Much Do You Think He Makes?Does knowing your colleagues' salaries make you happy or disgruntled?
The Canseco EffectWherever he went, Jose Canseco made his teammates better power hitters. Can statistics be used to find juicers?
Nudges Gone WrongA program designed to reduce energy consumption persuaded some Republicans to consume more.
Errors in JudgmentWere hundreds of criminals given the wrong sentences because lawyers messed up a basic work sheet?
Does Health Coverage Make People Healthier?A new study provides a compelling answer to the vexing question underlying the health care debate.
The Highest Form of FlatteryDo knockoff Prada bags hurt Prada—or help the company sell more of the real thing?
Mary Gates and Karen Zuckerberg Weren't Tiger Moms Is the Amy Chua approach bad for the American economy?
You Never Forget Your FirstWhy do voters tend to stick with whatever political party they join when they turn 18?
The Right Kind of Peer PressureWant girls to do better in school? Surround them with smart classmates.
We're Blowing ItA new paper suggests U.S. military aid does nothing to reduce drug production in Colombia.
400 Percent APR: Is That Good?Do people take out payday loans because they're desperate, or because they don't understand the terms?
Testing TestingEmployment tests may be racially biased—but what if they're less biased than human beings?
The Invisible Hand of GodAdam Smith thought competition among religions was a good thing. Does Hanukkah prove him wrong?