"You know your heart is always beating, your intestines digest your food, and even that your brain is still awake when you're asleep--that's no mystery. But why do we get 'brain freeze' if we eat ice cream too quickly? And why on earth do we get butterflies in our stomach when we're nervous? And is it true we can squirt milk from our eyes? This book focuses on the bizarre things all of our bodies do--including things we don't understand (looking at you, appendix)"--Provided by publisher.