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Why Sand is Squishy
- Sand squishiness depends on grain size and shape, with smaller, rounder grains making it squishier.
- Predicting sand's squishiness is complex due to how grains interact collectively, termed emergent properties.
Sam's Dog Beach Story
- Sam Sanders frequently visits a dog beach near L.A. and enjoys seeing dogs in costumes.
- He fondly recalls costume days especially for pugs dressed as superheroes, making the beach a joyful place.
Capillary Forces Hold Sand Castles
- Capillary forces created by water bridges hold sand castles together.
- This force works even at a molecular scale, making nano-sized sand castles theoretically possible but difficult to build.