You may know what you did yesterday, but do you know what your body did? Science writer Jennifer Ackerman probably does. She chronicles a day in the life of the human body, where everything from exercising to just waking up has a physiological effect, in her new book, "Sex Sleep Eat Drink Dream." Ackerman explores the body like a travel writer explores a seemingly familiar country, where some of the most interesting things are taken for granted. You can hear her read from the book and ask a few questions tonight at Porter Square Books. 7 p.m. Free. Porter Square Books, 25 White Street, Cambridge, 617-491-2220. portersquarebooks .com
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