Only 8% of the world’s currency is physical money. The rest exists only on computers.
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Your body is creating and killing about 2.4 million red blood cells per second.
17
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The chills you sometimes feel when listening to music is called "musical frisson."
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The human brain doesn't stop developing until about 25 years old.
102
Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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The world’s smallest book, “Teeny Ted from Turnip Town”, is 100×70 micrometers in size and requires a scanning electron microscope to read, as light beams are too large.
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