3

Magnetism

3

The Jeweled Frog and the Mighty Condor

3

The Jeweled Frog and the Mighty Condor

2

Jack's Sack

4

Maddy's Wisconsin Diary

3

Meteorites, Meteoroids, and Meteors

4

Money

3

Mars

3

Asteroids

3

Neptune

4

Dr. Why-Physics

4

Maddy's New York Diary

3

Light