Bestselling author A.J. Jacobs discusses his newest book The Guinea Pig Diaries: My Life as an Experiment on Wednesday, September 30, at 6:30 p.m. in the Truman Forum at the Plaza Branch, 4801 Main St.

The Guinea Pig Diaries is a collection of essays written by Jacobs as he immersed himself in eight different lifestyles to see what he could learn. For My Life as a Hot Woman, the author lived undercover as a beautiful woman, signing his son’s nanny up on a dating web site. For My Outsourced Life, he hired a team of people in Bangalore, India, to answer his e-mails, respond to phone calls, and argue with his wife for him (and then buy her gifts when he wins).

Jacobs is the author of two previous bestsellers, The Know-It-All: One Man’s Humble Quest to Become the Smartest Person in the World and The Year of Living Biblically, in which he followed every rule of the Bible.

The event is co-sponsored by Rainy Day Books. Copies of The Guinea Pig Diaries will be available for sale, and the author will sign copies purchased during the event.