Fact or fiction?

Do you believe in Sasquatch? Think you encountered Mothman? Then check out Loren Coleman's talk "Bigfoot, Sea Serpents, and Cryptozoology" tonight at the Museum of Science. The cryptozoologist will discuss the study of hair samples, animal droppings, footprints, and other evidence to prove or disprove the existence of unusual creatures, and will sign copies of his books "The Field Guide to Bigfoot, Yeti, and Other Mystery Primates Worldwide" and "Cryptozoology A to Z: The Encyclopedia of Loch Monsters, Sasquatch, Chupacabras, and Other Authentic Mysteries of Nature." 7 p.m. Free (tickets available at 5:45 in the lobby). Museum of Science, Science Park, Boston. 617-723-2500. www.mos.org/adultsJUNE WULFF