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.”
Roads & Kingdoms
Life After ISIS The Northern Iraqi city of Sinjar has been recaptured from ISIS, but it’s a long way from back to normal.
What Happened at Slate This Week? Stuff to read when you need to escape from your family gathering.
The Craziest Endings in College Football History After the turkey, enjoy some classic finishes.