“Ernie and Leela,” and “Ernie Under My Desk,” photographs by Tony Mendoza from his book Ernie: A Photographer’s Memoir, published by Chronicle Books. Courtesy the artist and Lee Marks Fine Art, Shelbyville, Indiana

Neuropsychologists developed a shorter IQ test for children with shorter attention spans. The depression-prone are less attracted to the political right. The nocturnal heart rate of young men can be predicted by their female partners’ daytime feelings of intimacy or annoyance. Men who pose for photos with cats are seen as less datable. Men can rate the facial attractiveness of women without paying attention,…