What reading level is At the bottom of the world?

At the bottom of the world by Bill Nye is at a Level 3-4 reading level (Lexile 680L). Recommended for Lower Grades readers (Ages 5-8).

What age is At the bottom of the world appropriate for?

At the bottom of the world is recommended for Ages 5-8. HootRating: 8LE (Light — Emotional).

What genre is At the bottom of the world?

At the bottom of the world is fiction — Juvenile Fiction.

Does At the bottom of the world have any content warnings?

At the bottom of the world has a HootRating of 8LE (Light — Emotional). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is At the bottom of the world?

At the bottom of the world by Bill Nye is 247 pages.

Reviewed by HootRated editorial · Last updated September 7, 2026

At the bottom of the world

Bill Nye

At the bottom of the world

Age Rating, Reading Level & Content Guide

At the Bottom of the World

by Bill Nye

Illustrated by Iluzada, Nicholas, illustrator

Reading Level 3-4 8LE Ages 5-8 Matched

The text is written at a 3rd grade reading level, the subject matter is intended for younger children (ages 5–8), and the content is mild with minimal sensitive material.

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About This Book

What if you found out your new foster siblings were geniuses who could build robots and solve math puzzles in their sleep? Imagine sneaking into a top scientist’s lab only to be whisked away on a wild trip to the bottom of the world—Antarctica! But when a scientist disappears and her secret research vanishes, can you help uncover the mystery before it’s too late?

Themes

OrphansBrothers and sistersAdventureScienceFriendship Mystery

Quick Assessment

This exciting chapter book follows Jack and his foster siblings, who are gifted young scientists, as they embark on an Antarctic adventure filled with mystery and real-world science. Written for early readers aged 5-8, it blends STEM education with an engaging story that encourages curiosity and problem-solving. The book is appropriate for young audiences and includes additional scientific facts and a hands-on project to extend learning.

Why we rated At the bottom of the world 8LE

At the bottom of the world is written at a Level 3-4 reading level with a Lexile measure of 680L across 247 pages. Strong independent readers around grade 4.5 can typically handle this book on their own; with parent or teacher support, At the bottom of the world works for readers up to grade 5.5.

We rate At the bottom of the world as 8LE ("Light — Emotional") because the content sits in the "Mild" range — mild conflict — the kind a child encounters in normal play and sibling life. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly mild; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the mild intensity score.

Thematically, At the bottom of the world explores orphans, brothers and sisters, adventure, science, and friendship — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 5-8 range — the maturity and attention span match the story's pacing.
✓ Kids drawn to stories about orphans, brothers and sisters, adventure.