Over and Under the Snow: Start the Series Here
Snow is not a lid on a dead world. There is a warmer gap underneath it, animals are awake and busy in there all winter, and this is the picture...
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Over and Under the Canyon: Shade Is the Habitat
Four books in this series hide their second world underground or underwater. This one hides it in shade, which is a stranger idea and a truer one about how deserts...
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Ada Twist and the Perilous Pants: Why Helium Goes Up
The funny part is the trousers. The useful part is the question underneath them, which is how high a thing can float and what makes it stop.
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Ada Twist and the Disappearing Dogs: Method, Out Loud
Most books that teach the scientific method hide it inside the plot. This one puts the words on the page, and for a certain child that is the reason to...
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T. Rex Teeth: How Anyone Knows What a Dinosaur Bit
Nobody has ever watched a T. rex eat. That single sentence is the difference between this book and the rest of the series on our shelf, and it is the...
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Animal Teeth: Which What If You Had Book to Buy First
A row of these sit on our shelf and every one of them is built to the same pattern. This is the one that started it, and it is the...
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