The research means our Y-chromosome tree is much longer than geneticists believed.
How to Green the U.S. Government The Defense Department and other agencies have found an easy way to switch to renewable energy. Now they need to do it a lot more.
The XX Factor
Duggar Revelations Are Just the Latest Sex Abuse Scandal to Rock Far-Right Fundamentalism
What Happened at Slate This Week? Assistant interactives editor Andrew Kahn on the best of Slate, from the history of slavery to Mad Men.
Ironic Misandry Claims Its First Victim A woman tweets #KillAllWhiteMen and the Internet explodes.
How Things Break Ali fought Liston 50 years ago. Two legends were born, but another was broken.