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Warmth

Level 1

Why do we feel warmer when we have a blanket tightly wrapped around us?

Because the blanket is made out of wool or fleece Because it looks cosy Because the blanket keeps the warmth inside

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Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 7 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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by Annie Li

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