Science stories sample

Read one wonder card before the full science library.

Science Stories opens with a real curiosity, a plain-English explanation, and a check-for-understanding question so new visitors can see the learning pattern first.

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Sample wonder card

The Tireless Heart

Your heart beats 100,000 times a day — that’s 35 million times a year. In your lifetime, it will beat 2.5 billion times without ever taking a break.

About how many gallons of blood does the heart pump each day?

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