A closer look at dark matter
Henry explores the evidence for dark matter and the theories of what it could be, with input from physicists Vuk Mandic and Luna Zagorac. The video is part of 50x50: Science Across America.
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MinutePhysics
Henry Reich makes illustrated videos that turn questions about physics, space and everyday science into explanations you can follow.
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Why hot objects glow
A short explainer uses blackbody radiation to connect the glow of lava and hot iron with the invisible infrared light emitted by people.
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A cube caught between two portals
Henry revisits a Portal thought experiment: what happens when two portals sandwich a cube? He uses a piston meeting itself to work through the puzzle.
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The wavy window paradox
A new optics explainer asks why a window can give you a clear view at all, even though light changes direction as it passes through glass.
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Guitar strings move in surprising ways
Henry examines the actual motion of vibrating instrument strings. He thanks Destin from Smarter Every Day for lending him a high speed camera.
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