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Browse by topic or search for a reading skill. These are nonfiction explainers, not a breaking-news feed.

Oceans

Why Don’t Sharks Sink?

Some sharks do sink when they stop. Find out how oil, cartilage and movement help them stay at depth.

Suggested Grades 3–4 · 280 passage words
Skill: Cause and effect
Dinosaurs

How Can Scientists Tell How Old a Dinosaur Was?

A fossil bone can hold growth clues, but counting its lines is not the same as reading a birthday.

Suggested Grades 3–4 · 274 passage words
Skill: Data and evidence
Dinosaurs

Did Velociraptor Really Have Feathers?

Small bumps on a fossil forearm provide a clue—but not a complete picture of the dinosaur.

Suggested Grades 3–4 · 276 passage words
Skill: Inference
Plants

Why Do Leaves Change Colour in Autumn?

Some autumn colours were in the leaf all summer. Others can develop as the season changes.

Suggested Grades 3–4 · 247 passage words
Skill: Sequence and cause