First-Ever ‘Einstein Zig-Zag’ Found in Space Could Help Solve the Universe’s Expansion Mystery
A compound lens forged by two galaxies is helping astronomers get a bead on the Hubble Constant and dark energy.
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46 Stocking Stuffers For Kids They'll Truly Love
They're great for kids of all ages! reviews: "Amazing toys! My 1- and 2-year-old LOVE them! They scream 'sticky balls!' and ...