KEEP ON FALLING T. Jefferson Parker reads from and signs his novel “The Fallen” (William Morrow), about a homicide detective whose senses are affected by a head injury. Tonight, 6 p.m., the Mysterious Bookshop, 58 Warren St., between Church and West Broadway, 212-587-1011, free.

HARD CORE Dean Karnazes discusses and signs his running memoir “Ultramarathon Man: Confessions of an All-Night Runner” (Tarcher), which includes tales of running the first marathon at the South Pole, completing a 199-mile relay race, and winning a 135-mile “ultramarathon” through Death Valley. Tonight, 7 p.m., Barnes & Noble Chelsea, 675 Sixth Ave. at 21st Street, 212-727-1227, free.

PEOPLE’S SCIENCE Clifford Conner discusses and signs his book “A People’s History of Science: Miners, Midwives, and ‘Low Mechanicks'” (Nation Books), in which he argues that “elite” scientists have often suppressed lower-class innovators while using their discoveries and accepting the resulting credit. Tonight, 7 p.m., McNally Robinson Booksellers, 50 Prince St. at Mulberry Street, 212-274-1160, free.

SILENT LAUGHTER Dave King discusses his novel “The Ha-Ha” (Little, Brown), newly in paperback. The story is told from the perspective of a Vietnam War veteran whose injuries have made him mute. Wednesday, 6:30 p.m., Strand Bookstore, 828 Broadway at 12th Street, 212-473-1452, free.

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