UsefulBS - Straight Facts
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Why are there often small, colorful flecks mixed into recycled paper products?
TLDR: The colorful flecks are tiny bits of contaminants like plastic, ink, and staples that are too small and costly to be completely filtered out during the paper recycling process.
How do some birds use fire as a clever hunting tool?
TLDR: Some birds, nicknamed firehawks, intentionally spread wildfires by picking up burning sticks and dropping them in new areas. This flushes out insects and small animals, creating an easy hunting ground for the birds.
Why was the S.O.S. distress signal chosen if it doesn't stand for anything?
TLDR: SOS does not stand for anything. It was chosen because its Morse code sequence of three dots, three dashes, and three dots (...---...) is a simple, continuous, and distinct pattern that is easy to recognize as a distress signal, even with interference.
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Why is there no actual lead in the lead of a modern pencil?
TLDR: Modern pencil lead is not lead; it is a non-toxic mix of graphite and clay. The name is a historical mistake from when graphite was thought to be a form of lead and early writing instruments used actual lead styluses.
Why do many towns have a literal wrong side of the tracks?
TLDR: The side of the tracks downwind from the prevailing winds collected all the smoke and pollution from steam trains and factories. The wealthy lived on the cleaner upwind side, while poorer industrial workers and minority communities were concentrated on the polluted side, creating a socioeconomic divide that persists today.
Why are ships and boats traditionally referred to as she instead of it?
TLDR: It is a tradition rooted in old maritime history, stemming from languages that assign gender to objects, sailors naming ships after goddesses or female figures for protection, and the personification of the vessel as a protective, mother-like figure that carries and cares for its crew.
Why did old tube televisions make a high-pitched sound that only kids could hear?
TLDR: The high-pitched whine from old tube TVs came from a component called the flyback transformer, which vibrated at about 15.7 kHz to draw the picture on the screen. This frequency is so high that only younger people, who haven't yet experienced age-related high-frequency hearing loss, could typically hear it.