Kids will look at things differently at Optical Illusions, a learning session for six-to-12-year-olds in which theyย’ll decipher impossible shapes, visual illusions and ambiguous pictures. After the session, kids can take a tour of the Houston Museum of Natural Science/Woodlandsย’ display of prehistoric beasts or the ย“Geopaloozaย” exhibit, a collection of amazing rocks and minerals. Noon Saturday, Sunday and Monday. 1201 Lake Woodlands Drive, The Woodlands. For information, call 281-364-7200 or visit www.hmns.org. $25.

Dec. 20-22, noon, 2008