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  • Beneath Sforza Castle in Milan, researchers have discovered a series of secret tunnels—passageways once sketched by the Renaissance artist and scientist Leonardo da Vinci and traversed by a widower sick with grief.

    The tunnels were discovered by experts from the Polytechnic University of Milan, who used ground-penetrating radar and laser scanners to map the 15th-century stronghold’s subterranean structures. The imaging revealed cavities and passageways positioned just a foot or two below the ground.

  • I am a simple man. I see GPR; I upvote.

    • You're a penetration enthusiast?

      • Haha, yep. In grad school my wingman would introduce me at the student pub like this:

        Wingman: "This is my buddy Troy. He studies penetration."

        "Oh really? How deep do you penetrate?"

        Me, as straightfaced as possible: "Depends on the frequency, but usually a few metres."

        Didn't work as well as offering to show them my six inch telescope (and then taking them moongazing), but still hilarious.

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