
The Arrow in the Coffee Cup: How Entropy Gives Time Its Direction
Entropy connects microscopic possibility with the direction of time, from cooling coffee to the organization of life.
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Student-written journeys through the ideas that shape our universe, from black holes and spacetime to the physics of sound | including the five YPWC winning essays.

Entropy connects microscopic possibility with the direction of time, from cooling coffee to the organization of life.
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Compare everyday fluids through viscosity, shear response, and the models used to describe their flow.
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Satellite clocks reveal why accurate navigation depends on Einstein’s descriptions of motion and gravity.
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Inside the oven: polar molecules, electromagnetic waves, sharp metal edges, and the mesh in the door.
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Discover how piezoelectric materials and electromagnetic induction can harvest energy from sound.
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A black hole has a temperature, stores entropy, and slowly loses energy. Follow the story from gravitational collapse to Hawking radiation.
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Starlight crosses the universe on paths shaped by gravity. Follow the curves of spacetime and the ideas that changed how we understand the cosmos.
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A phone’s quiet buzz and the bass line in a favorite song both begin with motion. Explore how vibrations travel, combine, and become the sounds we hear.
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