the.com/fireworks

controlled explosions we applaud, because humans decided gunpowder should also be pretty.

means Devices packed with gunpowder and metal salts that explode in colorful, noisy bursts for entertainment, especially during celebrations.

from A plain English compound of "fire" and "works" — the second part used in its old sense of "things made or engineered," as in metalworks or waterworks. The gunpowder behind the spectacle is much older, invented in China, where alchemists chasing immortality stumbled instead onto a powder that exploded — and pivoted, sensibly, to making it beautiful.

colors
Metal salts: copper for blue, strontium for red
origin
Invented in China over a thousand years ago
speed
Shells launch at 150 miles per hour
blue problem
True blue is the hardest color to make
sound delay
You see the boom before you hear it
for instance

dubai new year's eve — 6 minutes of continuous fireworks on january 1, 2014, using 500,000 fireworks along 94km of coastline

guy fawkes night — november 5 fireworks celebrations across uk commemorating the 1605 gunpowder plot

sydney harbour new year's — annual midnight fireworks display over sydney harbour since 1986, watched by over 1 million people

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