D-A-D. How can three lettersâ mean a 1001 things? Harry H. Harrison Jr."s latest dose of his trademark wit and wisdom pays tribute and provides insightâ to dads from all walks of life. From new dads, single dads, dads of adult kids and more, 1001 Things it Means to be a Dad is a topic we can all appreciate, especially when there"s "some assembly required" With two million books in the market, no one knows how to deliver simple, powerful insights like Harry.