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Here's the world's first video of an electron in motion, showing how an electron rides on a light wave after having just been pulled away from an atom. Electrons move so fast, it's almost impossible to generate a short enough burst of light to be able to see them move. But a new camera generates "attosecond pulses." (An attosecond is to a regular second as a second is to the age of the universe, says the MARS blog.) The next step: Film an electron colliding with an atom. [Attosecond Physics and High-Order Harmonic Generation]