3

Neptune

3

The Jeweled Frog and the Mighty Condor

2

Jack's Sack

3

Asteroids

4

Maddy's New York Diary

4

Dr. Why-Physics

3

Meteorites, Meteoroids, and Meteors

3

Mars

3

Magnetism

3

The Jeweled Frog and the Mighty Condor

4

Maddy's Wisconsin Diary

4

Money

3

Light