The title compelled me to read this book, as I was browsing scientific titles to diversify my summer reading. What a gem! At the beginning of the 20^th century, Henrietta Leavitt toiled as a human “computer” at Harvard’s observatory and determined a way to use star’s to determine time and distance. This would make for a perfect Paul Harvey anecdote. I love reading biographies of people who made a significant contribution to humankind and never received their due credit.