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Atoms & Forces

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greenhouse effect

Earth’s atmosphere, here in light blue, acts like the window on a glass greenhouse. Some gases — such as CO2 — trap certain wavelengths of light (here shown in red). That trapped energy, or heat, warms our planet. 

At a wearer’s command, an electric current can switch these sunglasses from dark to clear in about a second. 


This explosion was ready for its close-up. Chemists used a high-speed camera to figure out why metals explode when they come in contact with water.

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