UsefulBS
Straight facts. Answers to questions you never knew you had.
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Why does a shower curtain always pull inward toward you when the water is running?
Shower curtains pull inward because falling water creates a zone of low air pressure inside the shower. The higher air pressure outside then pushes the curtain toward the spray to fill that gap, a phenomenon driven by air vortices and temperature differences.
Why do large highway bridges use interlocking metal expansion joints to keep the road from buckling in the heat?
Metal expansion joints allow bridges to expand and contract safely as temperatures change. By providing a flexible gap, they prevent the concrete from buckling or cracking under heat-induced pressure while ensuring a smooth, continuous surface for vehicles.
Why do gasoline prices almost always end in nine-tenths of a cent?
Gasoline prices end in 9/10ths of a cent due to a combination of 1930s tax history and psychological marketing. This charm pricing makes fuel appear slightly cheaper to consumers, while the tiny fraction generates millions in additional revenue for retailers across billions of gallons sold.
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Recent Articles
Why do some old city sidewalks feature small purple glass blocks embedded into the concrete?
Known as vault lights, these glass prisms were installed in the late 19th century to illuminate underground basements with natural sunlight. Originally clear, the blocks turned purple over decades because the manganese used in the glass reacts to UV rays from the sun.
Why do the largest objects in a shaken container of mixed nuts always rise to the very top?
Shaking creates temporary gaps that small particles fall through, but large objects cannot. These smaller pieces settle underneath, gradually wedging the largest items to the top in a process known as the Brazil nut effect.
Why did sailors historically wear gold earrings to pay for their own funerals if they washed ashore?
Sailors wore gold earrings as a form of burial insurance to ensure that if they drowned and washed ashore, the value of the precious metal would pay for a proper funeral and a decent burial.
Why do some people possess a genetic mutation that causes them to grow a second row of eyelashes?
Distichiasis is a rare genetic condition caused by a mutation in the FOXC2 gene. This mutation causes cells that would normally develop into oil glands to instead form a second row of eyelashes along the inner eyelid. While often associated with a striking appearance, the extra lashes can sometimes cause eye irritation or vision problems if they rub against the cornea.