Science can explain some of the spookiness surrounding Halloween, at least that’s what biochemists think. Two Colorado State University graduate students will share that perspective Tuesday during a free presentation called “Vampires, Witches, Zombies and the Science Behind Halloween” at the Park Hill Library, 4705 Montview Blvd., from 5:30 to 7 p.m. This event is recommended for ages 12 and up, and registration is required by logging on to rams5280.colostate.edu. Then on Friday, Colorado State University’s Chemistry Club hosts a family-friendly Halloween Science Festival from 6:30 to 9 p.m. in the Chemistry Building on CSU’s main campus, near Lake Street and Centre Avenue in Fort Collins. This event will feature a large science show, Halloween crafts, carnival games and trick-or-treating. For more information about the festival, visit csuchemclub.org.

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