Invisible, Super-Smart Gadgets That Are Hidden All Around Us

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Brilliant inventions are all around us. No, literally. The tiniest, most pointless-looking gadget that you figured serves no purpose whatsoever is probably performing some essential function that you never knew about, right now.

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The tiny hole in an airplane window ensures that it doesn't blow out. An airplane window is made up of three acrylic panes the outer, the middle, and

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Those tiny holes on the top of Lego people heads are actually there to save the life of a child. In the event that a person swallows the head, the tun

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The sand-filled boxes under train seats help keep the train under control. BEC These boxes automatically dump sand onto the tracks when the wheels nee

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Reflective marker colors communicate key information for regular drivers and emergency services. For example: Red means the road is closed to traffic.

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The colorful, bright balls hanging on power lines prevent aircraft crashes. Power lines are very, very hard to see clearly from flying aircraft, so th

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Invisible, Super-Smart Gadgets That Are Hidden All Around Us

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A wire strung across poles in a city is a legalistic solution to a religious problem. For Orthodox Jewish religious purposes, the wire turns the area

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Those Braille-like bumps on the bottom of a bottle are used for inspection. Cola Coca-Cola 1ERIESCO ETOSMRL CONT The bump pattern identifies the type

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The weights on a wire or lamppost help keep it from failing. JMNOONNHN The weights, called Stockbridge dampers, keep fragile structures from vibrating

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The dot pattern around the edges of a car window keeps the window. in place. This pattern, called frit, is a layer of ceramic paint that protects the

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The bead on your dashboard tells your car whether it's day or night. This is the car's sunlight level of sensor. The sunlight lets the car know whethe

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The holes in electric prongs keep the plug from slipping out. Bumps inside the socket slide into the holes, ensuring the plug stays firmly in place. O