4

Yellowstone National Park

4

Washington Monument

3

Isaac Newton

3

Clayton Does The Unthinkable

3

Clayton Does The Unthinkable

4

Famous Americans: George Washington

3

David Livingstone

4

Stonehenge, England

4

Maddy's Washington Diary

4

Maddy's Washington, D.C. Diary

4

Jewels, Gemstones, and Birthstones

3

A Capitol Dream

4

Patsy and Paul at Uluru in Australia

2

Trouble at the Fair

3

Inertia

3

Doctor

2

One Odd Yellow Fellow

4

Mount Kilimanjaro, Tanzania

4

Lightning

4

Petra, Jordan

Kindergarten

Patterns

1

Things That Are Gray

2

Maddy Madcap

2

Country Flags of Europe

3

Meteorites, Meteoroids, and Meteors

1

Opposites

3

Judge

3

Lunar Eclipse

3

Halloween

4

Taj Mahal, India