Fossil Friday

A fossil

Again with the swirliness! But it’s not a summer repeat of the edrioasteroid. What, then, is it? If you think you know the answer, write it on a postcard or a scanning superconducting quantum interference device microscope—you can never have too many, right?—and mail it to NCSE, 1904 Franklin Street, Suite 600, Oakland CA 94612. Or just leave a comment below.