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Did You Know

Odd facts and small experiments worth trying carefully — true and honestly sourced.

• How to Make Fire With a Lemon

  Two copper contacts, a lemon, and a pair of steel paperclips can close a circuit — but it takes more than citrus to get a real flame. Here's the honest version of a classic survival-hack clip.

• Starting a Fire With a Sandwich Bag and Some Water

  A clear ziploc bag full of water can act as a lens and focus sunlight into a point hot enough to make tinder smoke. Here is why the trick works, and when it doesn't.

• The Ten-Second Tie Knot, Explained

  A clip of a man tying a full necktie in one ten-second motion circulated everywhere. It is not a camera trick — it is a pre-formed knot and one honest pull.

• The Police Station That Hired Geese

  A police station in China's Xinjiang region replaced guard dogs with geese — and the officer in charge called them a radar that does not need power. He had a point.

• Lake Baikal in Winter: The Ice That Rules a Sea

  Siberia's Baikal is the world's deepest lake — and every winter it freezes into slabs and hummocks that crack like thunder and glow turquoise.