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Topic
invention
7 passages across every level. Free to read, with comprehension quizzes.
How James Naismith Invented Basketball with Peach Baskets
L2 · ExplorerEasy
2 min read·5 Qs
The Birth of Coinage: How Ancient Lydia Revolutionized Trade
L5 · SageEasy
5 min read·10 Qs
The Clever Carpenter Who Started LEGO with Wood Scraps
L1 · SproutHard
1 min read·5 Qs
The Melted Candy Bar That Led to the Microwave Oven
L2 · ExplorerEasy
2 min read·5 Qs
The Quiet History of Your Toothbrush: From Pig Hairs to Nylon
L1 · SproutEasy
2 min read·5 Qs
The Split-Second Miracle: How Airbags Engineer Safety in a Flash
L4 · ScholarHard
8 min read·10 Qs
The Sticky Idea: How Velcro Was Invented by a Walk in the Woods
L2 · ExplorerMedium
2 min read·5 Qs