| Can You Count to a Googol? per Robert E. Wells 205 exemplars, 12 ressenyes | |
| Did a Dinosaur Drink This Water? per Robert E. Wells 143 exemplars, 24 ressenyes | |
| How Do You Lift a Lion? per Robert E. Wells 444 exemplars, 11 ressenyes | |
| What's Faster Than a Speeding Cheetah? per Robert E. Wells 123 exemplars, 1 ressenya | |
| What's smaller than a pygmy shrew? per Robert E. Wells 519 exemplars, 13 ressenyes | |
| What's So Special about Planet Earth? per Robert E. Wells 67 exemplars | |
| What's Older Than a Giant Tortoise? per Robert E. Wells 37 exemplars, 2 ressenyes | |
| Is a Blue Whale the Biggest Thing There Is? per Robert E. Wells 653 exemplars, 15 ressenyes | |
| Can We Share the World with Tigers? per Robert E. Wells 9 exemplars, 2 ressenyes | |
| Why Do Elephants Need the Sun? per Robert E. Wells 83 exemplars, 4 ressenyes | |
| How Do You Know What Time It Is? per Robert E. Wells 181 exemplars, 4 ressenyes | |
| Polar Bear, Why Is Your World Melting? per Robert E. Wells 50 exemplars, 1 ressenya |