A Book Series for Ages 6–12

Why Do They Do That?!

Gross, weird & true answers for curious kids. Every book in the series turns fifty real kid-asked questions into full-page illustrated answers — with a Wow Fact on every single one.

Why Do Bugs Do That?! book cover Why Do Sharks Do That?! book cover

The Series

One question. One page. A clear explanation, a hand-drawn diagram, and a Wow Fact — every single time.

Why Do Bugs Do That?! cover Available Now

Why Do Bugs Do That?!

Gross, Weird & True Answers for Curious Kids

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Why Do Sharks Do That?! cover Available Now

Why Do Sharks Do That?!

50 Wild Questions and Jaw-Dropping Answers About the Ocean's Most Misunderstood Hunters

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Why Do Dinosaurs Do That?! cover Available Now

Why Do Dinosaurs Do That?!

50 Wild Questions About the Real Dinosaurs — Answered by the Clues in Their Fossils

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Why Do Planets Do That?! cover Available Now

Why Do Planets Do That?!

50 Wild Questions About Space, Stars, and the Planets — Answered by the Clues Written in the Sky

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Why Do Bodies Do That?! cover Available Now

Why Do Bodies Do That?!

50 Wild Questions About Your Amazing Body — Answered by the Science Behind It

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Why Do Bugs Do That?!

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Illustrated portrait of Eli Thornwood

About Eli Thornwood

Eli Thornwood writes gross, weird, and true answer books for kids who ask a hundred "whys" a day. Every book in the Why Do They Do That?! series takes on a different corner of the natural world (bugs, sharks, dinosaurs, space, the human body) and turns real science into something kids actually want to read out loud at the dinner table. No textbook language, no filler, just the facts worth knowing.

When not chasing down another Wow Fact, Eli can usually be found outside with a magnifying glass, convinced the next amazing discovery is hiding under the nearest rock.

"Every good 'why' deserves a real answer — even the gross ones. Especially the gross ones."