Closing tabs

Why it's a good thing our ancestors didn't floss their teeth.

Tim Parks's life in writing.

An amazing video of the butterfly stroke.

Britt Peterson on Leanne Shapton's swimming memoir.  Long excerpt at the Guardian if you want to sample it for yourself; I don't think I liked the book as much as Britt did, but it's certainly worthwhile (don't read it on Kindle as the pictures are much less evocative than they would be in the print edition!).