4

Money

3

Neptune

3

The Jeweled Frog and the Mighty Condor

3

Asteroids

3

Meteorites, Meteoroids, and Meteors

2

Jack's Sack

4

Dr. Why-Physics

3

Mars

4

Maddy's New York Diary

3

Light

3

The Jeweled Frog and the Mighty Condor

4

Maddy's Wisconsin Diary

3

Magnetism