Today's book was Dark Banquet by Bill Schutt.
Most of the time I read random fantasy or sci-fi (ie my previous books were re-reading Robin Hobb's Farseer and Tawny man trilogies), but when I read anything else it tends to be about biology or evolution. Sometimes physics, and essentially never about computers.
So this time it was biology, and if you're interested in blood-sucking bats (the real kind, not the mythical ones), I don't think you can go wrong. It's fairly light reading, with a couple of laugh-out-loud moments. Recommended.