The obvious answer to the old “feathers or lead?” riddle is that they weigh the same, but clever research on the subject offers a more complicated view. Don’t count out so-called “dynamical symmetry.”
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.
How Things Break Ali fought Liston 50 years ago. Two legends were born, but another was broken.