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Wandering Jupiter Accounts For Our Unusual Solar System

Jupiter may have swept through the early solar system like a wrecking ball, destroying a first generation of inner planets before retreating into its current orbit, according to a new study published March 23 in Proceedings of the National Academy of Sciences.The...

Technology

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This Solar Bike Delivers Big

by Lorraine Chow Regular electric bikes are already pretty eco-friendly, but they usually need to be powered by fossil fuels. But now a Danish solar engineer, Jesper Frausig, has found a way around that by creating a bike that’s powered by the clean, green energy of...