Mary Roach is back, this time with Gulp where we meet scientists who tackle the questions no one else thinks of—or has the courage to ask. We go on location to a pet-food taste-test lab, a fecal transplant, and into a live stomach to observe the fate of a meal.

In Science Left Behind, Dr. Alex B. Berezow and Hank Campbell have drawn open the curtain on the left’s fear of science; it reveals, vague inclinations about the wholesomeness of all things natural, the unhealthiness of the unnatural, and many other seductive fallacies have led to an epidemic of misinformation making both sides culpable.