An artificial jellyfish made by impregnating silicone with muscle cells harvested from a rat's heart. Researchers designed the creature-vernacularly known as a medusa-to work as a simple stand-alone pump. Someday its cousin could function as a heart valve implant. The world's lightest solid material, an ultra-porous weave of carbon nanotubes that's one-sixth the weight of air. Since it conducts electricity, it could be ideal for lightweight lithium-ion batteries to power electric cars.
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