UsefulBS
Straight facts. Answers to questions you never knew you had.
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Why does every commercial airplane window have a tiny hole at the bottom of the middle pane?
Known as a bleed hole, this tiny opening regulates air pressure between the window panes to ensure the outer layer bears the load of cabin pressure. It also prevents fog and frost from obscuring the view by allowing moisture to escape.
Why do escalators have stiff brushes along the sides to keep your shoes from being sucked into the moving gaps?
These brushes, known as skirt deflectors, are safety features designed to prevent shoes and loose clothing from getting caught in the gap between the moving steps and the side wall. They serve as a tactile warning to keep passengers away from the edges, significantly reducing the risk of entrapment.
Why do flight attendants keep their hands behind their back while greeting passengers to hide a manual tally counter?
Flight attendants keep their hands behind their backs to discreetly use a manual tally counter to track the number of boarding passengers. This ensures the headcount matches the flight manifest for safety purposes without distracting or intimidating travelers during the greeting process.
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Why do your fingers feel strangely slippery after touching bleach as the chemical literally turns your skin into soap?
Bleach feels slippery because its high alkalinity triggers a chemical process called saponification. This reaction transforms the oils and fats on your skin into soap, meaning that slimy sensation is actually your own tissue being chemically converted into a lubricant.
Why is it impossible for your brain to feel the sensation of being tickled when you tickle yourself?
Your brain cannot tickle itself because the cerebellum predicts the sensory consequences of your own movements. This anticipation allows the brain to suppress the sensation, focusing instead on unexpected external stimuli. Because there is no element of surprise, the brain cancels out the ticklish feeling before you even move.
Why do some people experience a sudden uncontrollable sneeze when they step into bright sunlight?
This phenomenon is called the photic sneeze reflex, a genetic trait where bright light overstimulates the optic nerve. Because this nerve sits close to the trigeminal nerve responsible for sneezing, the brain confuses the signals, triggering a sneeze in response to sudden brightness instead of a nasal irritant.
Why was the Statue of Liberty originally a dull copper brown before it turned its iconic green color?
The Statue of Liberty was originally copper brown because it is constructed from thin copper sheets. Over roughly thirty years, exposure to oxygen and moisture caused a chemical reaction called oxidation, creating a thin green layer known as a patina that now protects the statue from further corrosion.