Harmony Museum on Mercer Street in Harmony is open from 1 to 4 p.m. daily; closed 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 "Did You Know? Nanotechnology Workshop," a featured program of the center's spring SciTech Days running Tuesday through March 12. Science center 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. Regular admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 12. Parking is $5. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.<B>Heinz History Center</B>, 1212 Smallman St., continues through July 18 "Discover the Real George Washington: New Views from Mount Vernon," an exhibition from George Washington's Mount Vernon Estate & Gardens. The exhibition features highlights from Mount Vernon's collection and provides a new perspective on Washington, his achievements and legacies, his family, and his intellectual pursuits and entrepreneurial ventures. Visitors can view nearly 100 objects, including full-scale figures of Washington, architectural models, decorative and fine art items, maps, manuscripts and paintings. History center hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $10 for adults, $9 for senior citizens age 62 and older, $5 for students with ID and for children ages 4 to 17, and free for children 3 and younger. Call 412-454-6000.<B>ToonSeum</B>, Pittsburgh's Museum of Cartoon Art, 945 Liberty Ave., continues "Civil Rights Superheroes: Martin Luther King and the Montgomery Story" through March 14. The exhibit examines the role of a comic book in the civil rights movement. The museum is open from 10 a.m. to 3 p.m. Wednesdays and Thursdays, 10 a.m. to 5 p.m. Fridays and Saturdays and 11 a.m. to 4 p.m. Sundays, except holidays. Admission is $4 for adults and $3 for children ages 5 to 17; children younger than 5 are admitted free. Visit the Web site, www.toonseum.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave., Oakland, continues the traveling exhibition "Whales/Tohora" through May 2. Museum 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. Admission, which includes the Carnegie Museum of Art, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older, and free for members and children younger than 3. Free admission is being offered from 3:30 to 8 p.m. Thursdays in March. Call 412-622-3131 or visit the Web site, www.carnegiemnh.org.<B>National Aviary</B>, 700 Arch St., has winter hours from 10 a.m. to 5 p.m. Mondays through Saturdays and noon to 5 p.m. Sundays. Admission is $10 for adults; $9 for senior citizens; $8.50 for children 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.