Harmony Museum on Mercer Street in Harmony, offers regular guided tours from 1 to 4 p.m. daily except Mondays and holidays; reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit the Web site, www.harmonymuseum.org.

<B>Carnegie Science Center</B>, One Allegheny Ave. North Side, hosts engineers from local agencies, societies, universities and companies to celebrate achievements and future challenges at Engineer the Future on Friday and Saturday. More than 50 exhibitors, including SAE International, the U.S. Army Corps of Engineers, US Steel, University of Pittsburgh American Nuclear Society, American Society of Civil Engineers, and Carnegie Mellon University will present hands-on activities, exhibits and demonstrations for the whole family. On Saturday, select eighth grade students will compete in a robotic car race at 3:30 p.m. Regular hours are 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays. Admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 18. Parking is $3. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave. in Oakland, exhibits "Dinosaurs in Their Time." Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Closed major holidays. Through Feb. 27, all children's admissions are half-priced at $5.50 per child ages 3 to 18. Children under 3 are admitted free. Adult admission is $15, while seniors, 65 and older, are $12, and students with valid ID are $11. Admission includes the Museum of Art. Call 412-622-3131 or www.carnegiemnh.org.<B>National Aviary</B>, 700 Arch St., hosts FliteZone inside for a new show running from 11 a.m. to 1:30 p.m. Wednesdays through Sundays. Flamingos have been added to the spectacle. Regular hours are 10 a.m. to 5 p.m. daily. Regular admission is $10 for adults; $9 for senior citizens; $8.50 for children ages 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. on Fridays. Admission rates are $10 for adults, $9 for seniors age 62 and older and students with ID, and $7 for children ages 2 to 18. Phipps members and children under 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Heinz History Center</B>, 1212 Smallman St., features its new exhibit, "Pittsburgh: A Tradition of Innovation," tracing Western Pennsylvania's imprint on the world. Hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $9 for adults, $7 for senior citizens older than 61, $5 for students with ID and for children ages 6 to 18, and free for children younger than 6. Call 412-454-6000.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, hosts the traveling exhibit "Exploring Trees Inside and Out" through May 17. Regular museum hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays. Admission is $9 for children 2 to 18 and senior citizens and $10 for adults; children younger than 2 are admitted free. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org.