› added 12 years ago

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TIL a Canadian Research Firm has developed Invisible Camouflage, and is sharing it w/ the U.S. Government.

Read more businessinsider.com

via reddit.com

OEo6 TIL that China invented fireworks, but Italy gave them color. Colors are created using metallic powders. Calcium makes orange, sodium makes yellow, and barium makes green. Also, cylindrical tubes create whistling sounds, aluminum flakes make hissing noises, and flash powder makes the loud “booms.”
RA1a TIL that it is so hard to swat a fly because they piece together images sent from their eyes to the brain, 250 times faster than humans.
wJW8 TIL Ancient Greeks built a 7 mile wall from Athens to the port of Piraeus to guarantee safe passage to the sea
WkeNL TIL there are 7 days in a week thanks to the Babylonians, who lived in modern-day Iraq. As keen observers of the heavens, the Babylonians adopted 7 days because they observed 7 celestial bodies — the Sun, the Moon, Mercury, Venus, Mars, Jupiter, and Saturn.
Md4A TIL Costco sells approximately 100 million hot dogs a year in their food court – over four times the number sold in all Major League Baseball stadiums combined.