>Dr. Robert Provine’s Curious Behavior explores the human body’s odd outbursts, from hiccups to sobs and beyond. Some surprises:

YAWNING CAN BE, UM, FUN.

It’s often brought on by boredom, yet for people taking certain antidepressants, a yawn can lead to orgasm.

LADY TEARS ARE A TURN-OFF.

A study in which men smelled women’s tears vs. saline drops found guys were less aroused after sniffing the real thing.

LAUGHTER ISN’T UNIQUE TO HUMANS.

Chimps, dogs, all “mammals do it,” writes Provine. It’s the “sound of the labored breathing of physical play.” Oh, and rats are ticklish.

A SNEEZE COULD KILL.

Provine writes of a man who died after a particularly violent achoo; others have suffered retinal detachment, loss of consciousness or stroke. Want to stop an oncoming one? Prop your eyes open: We almost always sneeze with eyes closed.

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