I've freaked myself out somewhat by reading about human anatomy (Bill Bryson, The Body). What a machine! All these processes going on all the time, glands spurting out this or that hormone, heart thumping away, kidneys filtering out the salt I sprinkled on my dinner. It's amazing and alarming. I could help things out by sleeping, but here I am, wide awake. 4.44am now ...
Yes.... it has some interesting stats and info, and Bryson's breezy style makes it an easy read. For instance: "If you put all Earth’s microbes in one heap and all the other animal life in another, the microbe heap would be twenty-five times greater than the animal one."
I'm especially enjoying the historical stories, all the crazy medical practices in the past, how breakthroughs were made and so on.