Plodding along in the slow lane at my local pool for a bit of R&R, I noticed that the swimmer behind me was quickly becoming rather impatient. For a minute, I thought I’d mistakenly plonked myself in ...

If you spend a lot of time with certain frogs, you’ll probably notice a behavior called toe-tapping: a rapid up-and-down movement of the middle toes of the hind legs. People have known about ...