Beautiful book physically, and otherwise exactly the same as Randall's first "What if" and his website of the same name.

It's much better in small doses, and I'm not sure it'll do well on a re-read but I've very much enjoyed learning whether the spiders on Earth have a greater gravitational attraction than the Sun, or how to heat the atmosphere with toaster ovens.

Unsurprisingly it's got a strong US focus!