4

Money

3

Neptune

4

Maddy's New York Diary

3

Light

3

Asteroids

4

Maddy's Wisconsin Diary

4

Dr. Why-Physics

3

The Jeweled Frog and the Mighty Condor

3

The Jeweled Frog and the Mighty Condor

3

Meteorites, Meteoroids, and Meteors

3

Magnetism

3

Mars

2

Jack's Sack