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Performances

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

"DINOSAUR BABIES" -- Friday at 10 and 11:30. Friday at 10 and 11:30 for ages 6 to 12. $5. Reservations recommended. By Discovery Theatre in the Ripley Center, 1100 Jefferson Dr. SW. 202-357-1500 or 202-357-3030.

UNIVERSOUL CIRCUS -- Friday at 10:30 and 7:30; Saturday at noon, 4:30 and 8; Sunday 1, 4 and 7. $10 to $29 plus service charges. Capital Plaza Mall, 6200 Annapolis Rd., Landover Hills. 202-397-7328 or 800-316-7439.

"MONSTER IN THE CLOSET" by the Children's Theatre, Friday at 7:30, Saturday at 3 and 7:30, Sunday at 3. $10, seniors, students and children $8. Reservations recommended. Thomas Jefferson Community Theatre, 125 S. Old Glebe Rd., Arlington. 703-548-1154.

"LITTLE RED RIDING HOOD & the 3 Little Pigs," through July 17. Friday at 10 and 11:30, Saturday-Sunday at 11:30 and 1, Wednesday-Thursday at 10 and 11:30. $7. Reservations recommended. The Puppet Co. Playhouse, Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 301-320-6668.

"ALEXANDER AND THE TERRIBLE, Horrible No Good, Very Bad Dad," through July 17. Saturday and Sunday at 1:30 and 3:30. $7. Adventure Theatre, Glen Echo Park, 7300 MacArthur Blvd., Glen Echo. 301-320-5331.

ARLINGTON SYMPHONY -- Sunday at 1, in a family program with music from "Harry Potter and the Prisoner of Azkaban" and a hands-on art activity. $15, ages 12 and under $7.50. Rachel Schlesinger Arts Center, Northern Virginia Community College, 3001 N. Beauregard St., Alexandria. 703-548-0885.

"TINY TOTS CONCERT" by the Annandale High School Orchestra and theater department, Tuesday at 4. $2 in advance, $3 at the door. Annandale High School, 4700 Medford Dr., Annandale. 703-642-4245.

UNIVERSOUL CIRCUS -- through June 19. Tuesday at 7:30, Wednesday-Thursday at 10:30 and 7:30. $10 to $29 plus service charges. Security Mall, 6901 Security Blvd., Baltimore. 202-397-7328 or 800-316-7439.

"AFRICAN TALES" by Barefoot Puppets, Wednesday at 7:30. Friendship Heights Village Center, 4433 S. Park Ave., Chevy Chase. 301-656-2797.

Spcial Events

"IMAGINASIA" -- Saturday and Sunday at 2. Art tour and workshop for ages 6 to 14. Arthur M. Sackler Gallery, 1050 Independence Ave. SW. 202-357-2700 (TDD: 202-357-1729).

"MUPPET TREASURE ISLAND" -- feature film, and a magic show, Saturday at 10. $5. Publick Playhouse, 5445 Landover Rd., Cheverly. 301-277-1710.

"BECOME A PILOT" FAMILY DAY -- Saturday 10 to 5, outdoor display of about two dozen visiting aircraft, including a Marine Corps Harrier, with talks with pilots and hands-on activities. Air and Space Museum Udvar-Hazy Center, in Chantilly off Route 28 adjacent to Dulles Interational Airport. 202-633-1000.

MODEL TRAIN DISPLAY -- Sunday 1 to 5, two large operating layouts and related models. $3 to $5 donation requested. Baltimore Society of Model Engineers, 225 W. Saratoga St., Baltimore. 410-837-2763.

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. 202-633-4800.

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.

ARLINGTON PLANETARIUM -- "Hubble Vision 2," through Sunday. Friday at 7:30, Saturday at 7:30 and Sunday at 1:30 and 3. $3, seniors and ages under 12 $2. 1426 N. Quincy St., Arlington. 703-228-6070.

Places to Visit

MARYLAND SCIENCE CENTER -- Exhibits: "Titanic: The Artifact Exhibition," through Sept. 5; "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, depending on options selected, $14-$19.50, ages 4 to 12 $9.50-$13.50. Open Friday-Saturday 10 to 8, Sunday- Wednsday 10 to 6, Thursday 10 to 8. 601 Light St., Baltimore. 410-685-5225.

PORT DISCOVERY -- "Miffy and Friends," through May 15. 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. $8.95, seniors and ages 2 through 12 $6.95, younger free. Wagon rides $1, pony rides $2.50. 19270 James Monroe Highway, Leesburg. 703-433-0002.

GARGOYLE'S DEN -- Saturday 10 to 2, for ages 6 to 12. Explore stone carving, mosaics, stained glass and other crafts. $5 per group of up to 4; each additional person $1. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. 202-537-2934.

CLAUDE MOORE COLONIAL FARM -- 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 $5, seniors and students $4, under 13 $2. Open Friday-Saturday 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 Friday-Sunday and Wednesday-Thursday 10 to 6. $5, seniors $4, ages 3 to 16 $3. World Trade Center, 401 E. Pratt St., Baltimore. 410-837-8439.

Library Programs

ACCOKEEK -- Stories for ages 3 to 5, Tuesday at 10:30, and for ages 3 to 6, Wednesday at 7. 16200 Livingston Rd. 301-283-2521.

ARLINGTON CENTRAL -- Stories for ages 3 to 6, Friday at 10. 1015 N. Quincy St. 703-228-5946.

BADEN -- Stories for ages 2 to 5, Wednesday at 10:30. 13603 Baden-Westwood Rd., Brandywine. 301-888-1152.

BELTSVILLE -- Stories for ages 3 to 5, Wednesday at 10:30. 4319 Sellman Rd. 301-937-0294.

BOWIE -- Stories for ages 3 to 5, Monday at 1 and Thursday at 10:30, and for ages 4 to 6, Tuesday at 7. 15210 Annapolis Rd. 301-262-7000.

CENTREVILLE -- Stories for ages 2 to 5, Wednesday at 7:30. 14200 St. Germaine Dr., Centreville. 703-830-2223.

CHERRYDALE -- Stories for all ages, Wednesday at 7. 2190 Military Rd., Arlington. 703-228-6330.

DOLLEY MADISON -- Stories for ages 2 to 5, Wednesday at 10:15. 1244 Oak Ridge Ave., McLean. 703-356-0771.

FAIRMOUNT HEIGHTS -- Storytime for ages 3 to 5, Wednesday at 10:30. 5904 Kolb St. 301-883-2700.

GLENARDEN -- Stories for ages 2 to 5, Thursday at 10:30. 8724 Glenarden Pkwy. 301-772-5477.

GREENBELT -- Stories for ages 3 to 5, Thursday at 10:30. 11 Crescent Rd. 301-345-5800.

HILLCREST HEIGHTS -- Stories for ages 3 to 5, Tuesday and Thursday at 10:30. 2398 Iverson St. 301-630-4900.

HYATTSVILLE -- Stories in English and Spanish for ages 3 to 6, Saturday at 10:30. Stories for ages 3 to 5, Tuesday at 11, and for ages 3 to 6, Wednesday at 7. 6530 Adelphi Rd. 301-985-4690.

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

LARGO-KETTERING -- Stories for ages 3 to 5, Wednesday at 7 and Thursday at 10:30. 9601 Capital Lane, Upper Marlboro. 301-336-4044.

MARTHA WASHINGTON -- Stories and activities for ages 3 to 5, Friday at 1. 6614 Fort Hunt Rd., Alexandria. 703-768-6700.

MOUNT RAINIER -- Stories for ages 3 to 5, Wednesday at 11. 3409 Rhode Island Ave., Mount Rainier. 301-864-8937.

NEW CARROLLTON -- Stories for ages 3 to 7, Tuesday at 7 and Thursday at 10:15. 7414 Riverdale Rd. 301-459-6900.

SHIRLINGTON -- Stories and activities for ages 3 to 6, Wednesday at 7. 2786 S. Arlington Mill Dr., Arlington. 703-228-6545.

SPAULDINGS -- Stories for ages 2 to 6, Monday at 7, and for ages 3 to 5, Thursday at 10:30. 5811 Old Silver Hill Rd., District Heights. 301-817-3750.

SURRATTS-CLINTON -- Stories for ages 3 to 5, Tuesday at 10:15, 11 and 11:45, and for ages 3 to 7, Wednesday at 7. 9400 Piscataway Rd., Clinton. 301-868-9200.

UPPER MARLBORO -- Stories and activities for ages 3 to 5, Tuesday at 11. 14730 Main St. 301-629-9330.