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Why Do Rivers Meander?
$3.99
Why Do Rivers Meander?
Rivers twist and turn as they make their way to the sea. Why does this happen and how can this be explained mathematically? In this module we look at the geometry of meandering rivers. In the process we'll discover some fascinating numerical relationships.
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The Archer Fish, Geometry, and Physics
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The Archer Fish, Geometry, and Physics
The Archer Fish earns its name because it accurately sprays jets of water at insect prey, knocks them into the water, and has a quick meal. The ability to accurately do this has to overcome several geometric and physical challenges. In this module students explore these challenges in more detail.
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Why Do Elephants Have Wrinkled Skin?
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Why Do Elephants Have Wrinkled Skin?
Have you noticed how wrinkled an elephant's skin is? What purpose does it serve and what does math have to do with explaining this phenomenon? Well, the explanation for an elephant's wrinkled skin is almost entirely a math story. 
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Why Are Castles So Tall?
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Why Are Castles So Tall?
Why are castles so tall? In this module students explore indirect measurement by seeing how simple angle measure, height measurements, and tangent ratios can be used to calculate distances. The context of castles provides a historically relevant military purpose for the tallness of castles.
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