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Scientists Just Found Leonardo da Vinci’s Hidden Tunnels — Thanks to a Forgotten Sketch

For centuries, the mystery lingered beneath Milan’s streets — and now, it’s no longer just a legend. Secret tunnels, sketched by Leonardo da Vinci in 1495, have finally been uncovered beneath Sforza ...

Here’s Why There’s a Line at the Bottom of Your Phone Screen

You've seen that little line on your smartphone, but why is it there? We'll explain how to use it—and how to get rid of it on ...