Plant Power (6 titles)
|
|
|
|
|
Geology Genius (8 titles)
|
|
|
|
|
The Internet
|
|
3.0 |
|
|
The Moon Landing
|
|
2.8 |
|
|
Prickly Plants
|
|
2.8 |
|
|
My Government (5 titles)
|
|
|
|
|
The First Flight
|
|
2.9 |
|
|
Incredible Animal Life Cycles (1 title)
|
|
|
|
|
Cell Phones
|
|
3.0 |
|
|
Being an Active Citizen (3 titles⁎)
|
|
|
|
|
Hot Air Balloons
|
|
2.8 |
|
|
Airplanes
|
|
2.6 |
|
|
Speedboats
|
|
2.5 |
|
|
Titanic
|
|
3.1 |
|
|
Hindenburg
|
|
3.2 |
|
|
Chernobyl
|
|
3.0 |
|
|
Nature's Superheroes (5 titles)
|
|
|
|
|
Trains
|
|
2.9 |
|
|
Challenger
|
|
3.0 |
|
|
Cars
|
|
2.6 |
|
|
Man-Made Disasters (5 titles)
|
|
|
|
|
Helicopters
|
|
2.8 |
|
|
Deepwater Horizon
|
|
3.0 |
|
|
Motorcycles
|
|
2.6 |
|
|
