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Performances

These events for children and families are free unless a fee is noted.

"DREAMOSAURUS" by Dinorock Productions, Friday at 10 and 11:30; Saturday and Sunday at 11:30 and 1. $7. Reservations recommended. The Puppet Co. Playhouse, Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 301-320-6668.

"NORTH, SOUTH, EAST & Jim West," multi-cultural puppetry, music and storytelling by Jim West, Saturday at 11. $6, seniors, students and children $5. Parilla Performing Arts Center, Montgomery College, 51 Mannakee St., Rockville. 301-279-5301.

"OH, SUSANNAH!" -- songs and movement by Susan McNelis, Tuesday at 10:30. $4. Jammin' Java, 231 Maple Ave. E., Vienna. 703-255-1566.

Nature

NATIONAL ZOO -- Grounds open daily 6 a.m. to 8 p.m., most animal buildings and Amazonia open 10 to 6 (exceptions are posted). Seal and sea lion training at 11:30, elephant care sessions at 11 most days. 3001 Connecticut Ave. NW. 202-673-4800.

NATIONAL AQUARIUM -- More than 1,000 specimens of aquatic life, including an alligator exhibit. Open daily 9 to 5 (last admission 4:30). Adults $5, seniors $4, ages 2 to 10 $2, younger free. Department of Commerce Building, 14th and Constitution NW. 202-482-2825.

BALTIMORE AQUARIUM -- The National Aquarium in Baltimore features a marine mammal pavilion, an Atlantic coral reef exhibit and a South American rain forest. Timed-entry tickets required. Open Friday 9 to 8, Saturday-Thursday 9 to 5. Admission $17.50; seniors $14.50; ages 3 to 11 $9.50 (under 3 free). Pier 3, 501 E. Pratt St., Baltimore. For information, 410-576-3800; for advance tickets, Ticketmaster, 202-397-7328 or 410-481-7328 (service charges added).

NATIONAL WILDLIFE VISITOR Center -- Interior Department science and environmental education center offers interactive exhibits and films. Open daily 10 to 5:30. Patuxent Research Refuge, 10901 Scarlet Tanager Loop, Laurel. 301-497-5760.

ROCK CREEK NATURE CENTER -- Planetarium shows: "The Night Sky," Saturday and Sunday at 1 for ages 4 and up; "Exploring the Universe," Saturday and Sunday at 4 for ages 7 and up; planetarium show for younger children, Wednesday at 4 for ages 2 to 10. Free planetarium tickets distributed 30 minutes before each show. 5200 Glover Rd. NW. 202-895-6070.

Places to Visit

MARYLAND SCIENCE CENTER -- Exhibits: "Dino Digs," about dinosaurs native to Maryland; "Chesapeake Bay"; "Outer Space Place." Hands-on exhibits and demonstrations of scientific principles. IMAX films screened hourly. Planetarium show, hourly. Admission, including planetarium show and IMAX, is $16, seniors $14, ages 3 to 12 $12.50. Open Friday 10 to 5, Saturday 10 to 6, Sunday noon to 5, Monday-Thursday 10 to 5. 601 Light St., Baltimore. 410-685-5225.

PORT DISCOVERY -- Interactive fantasy structures, mechanical sculptures and related activities. Open Friday-Saturday 10 to 5, Sunday noon to 5, Tuesday-Thursday 10 to 5. $11, ages 3 to 12 $8.50, under 3 free. 35 Market Pl., Baltimore. 410-727-8120.

LEESBURG ANIMAL PARK -- Petting zoo and related activities, open Friday-Sunday 10 to 5, Tuesday-Thursday 10 to 3. $7.95, seniors and ages 2 through 12 $5.95, younger free. 19270 James Monroe Highway, Leesburg. 703-433-0002.

CATHEDRAL CRAFTS -- Saturday 10 to 2, for ages 6 to 12. Explore mosaics, stained glass, stone carving and crafts. $7; reservations required for groups larger than 10. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. 202-537-2934.

CLAUDE MOORE COLONIAL FARM -- Help the farm wife on 18th-century Colonial wash day, Saturday from 1 to 4. Visit a re-creation of an 18th-century family farm, open Friday-Sunday and Wednesday-Thursday from 10 to 4:30. $3, seniors and ages 3 to 12 $2. 6310 Georgetown Pike, McLean. 703-847-0710.

NATIONAL COLONIAL FARM -- The mid-18th-century tobacco plantation is open Friday-Sunday and Tuesday- Thursday from 10 to 5. Adults $2, under 12 50 cents; $5 maximum per family. 3400 Bryan Point Rd., Accokeek. 301-283-2113.

OXON HILL FARM -- The working farm is open daily from 9 to 4:30, with farm demonstrations and tours. Oxon Cove Park, 6411 Oxon Hill Rd., Oxon Hill. 301-839-1176 (TDD: 301-839-1783).

COLVIN RUN MILL -- Tour the 19th-century gristmill 11 to 5 daily except Tuesday. Adults $5, children $3. 10017 Colvin Run Rd., Great Falls. 703-759-2771.

OLD STONE HOUSE -- Tour the 1765 structure Friday-Sunday and Wednesday-Thursday noon to 5. 3051 M St. NW. 202-426-6851.

SULLY HISTORIC SITE -- The restored 1794 mansion, furnished with Federal-period antiques, is open from 11 to 4 daily except Tuesday. Hourly guided tours $5, students $4, seniors and ages 5 to 15 $3. 3601 Sully Rd., Chantilly. 703-437-1794.

TROLLEY MUSEUM -- Ride European and American trolleys, Saturday and Sunday noon to 5. Exhibits free; rides $3, seniors and ages 2 through 17 $2. Northwest Branch Park, 1313 Bonifant Rd., Silver Spring. 301-384-6088.

B&O RAILROAD STATION MUSEUM -- Permanent exhibits include a diorama depicting the trip of Tom Thumb, America's first scheduled passenger train. Adults $4, seniors and students $3, under 13 $2. Open Friday-Saturday and Monday 11 to 4, Sunday noon to 5. 2711 Maryland Ave., Ellicott City. 410-461-1944.

TOP OF THE WORLD -- Presentation about Baltimore and a view of the city from the 27th floor observation level. Open Sunday through Friday 10 to 6, Saturday 10 to 9 . $4, seniors $3, ages 3 to 16 $2. World Trade Center, 401 E. Pratt St., Baltimore. 410-837-8439.

Library Programs

BROOKLYN PARK -- Stories for ages 2 to 6, Thursday at 7.1 E. 11th Ave. 410-222-6260.

GEORGE MASON -- Stories for ages 3 to 5, Thursday at 10:30. 7001 Little River Tnpk., Annandale. 703-256-3800.

HERNDON -- Stories and activities for ages 3 to 5, Thursday at 2. 768 Center St. 703-437-8855.

JOHN MARSHALL -- Stories for ages 2 to 5, Wednesday at 10:30. 6209 Rose Hill Dr., Alexandria. 703-971-0010.

JUANITA THORNTON -- Activities for ages 3 to 5, Tuesday at 11, and for ages 2 to 7, Thursday at 10:30. 7420 Georgia Ave. NW. 202-576-7114.

POHICK -- Stories for ages 2 to 5, Tuesday at 10:15 and Wednesday at 1:30. 6450 Sydenstricker Rd., Burke. 703-644-7333.

RICHARD BYRD -- Stories and activities for ages 2 to 5, Wednesday at 10:30. 7250 Commerce St., Springfield. 703-451-8055.

SHERWOOD -- Stories and crafts for 6 to 10, Wednesday at 11. 2501 Sherwood Hall Lane, Alexandria. 703-765-3645.

WOODROW WILSON -- Stories and other activities for ages 6 to 12, Saturday at 10:30. 6101 Knollwood Dr., Falls Church. 703-820-8774.