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421/ Stainless Steel was first
invented in 1913 by Harry Brearley in England.
422/ It was used for WW1 aircraft
engine valves before being used for cutlery in 1919.
423/ In 1929 Richard Drew,
a 3M employee, ordered 100 yards of Cellophane and applied
glue to one side. This was sold as Scotch tape a year later.
424/ In 1938, Du Pont researcher
Roy Plunkett discovered Teflon by accident when trying to
come up with a new gas to use in refrigerators. Used in the
first atom bomb, the discovery wasn't made public until 1946.
425/ The basic chemical formula
of natural rubber was worked out in 1826 by Michael Faraday.
426/ It wasn't until 1927
that German chemists came up with a synthetic alternative
to natural rubber.
427/ The foam fire extinguisher
was invented by Professor Alexander Laurent in St Petersburg
in 1905.
428/ French Physicist Georges
Claude displayed a neon light for the first time at the Paris
Motor Show in 1910. It could only produce a red glow.
429/ The bulldozer was first
introduced in 1923 by the American Caterpillar Tractor company.
Their first job was building Autobahns on Germany.
430/ In 1938 Hungarians Ladislao
and George Biro patented their idea of a ball-nibbed pen with
quick drying ink.
431/ In 1958 the disposable
version of the Biro - the Bic - was invented by Marcel Bich.
432/ The Sun's magnetic activity
varies dramatically, waning and intensifying again every eleven
years.
433/ Until the 1950's pregnancy
was diagnosed by injecting urine into mice. If the urine contained
a pregnancy hormone, the animal would ovulate.
434/ The first rapid home
pregnancy test was launched in 1985.
435/ A human brain reaches
its maximum size of 3 pounds by the age of six.
436/ The Amazon pours out
fresh water into the Atlantic...more than 160km out at sea
from the river's mouth the water is still fresh.
437/ Male flies only gather
at the base of bright lights as they are having a mating asembly.
438/ A bee can see the colours
green, blue and ultra-violet - but red looks like black.
439/ A bee must visit 4,000
flowers in order to make one tablespoon of honey.
440/ Around 8,000 of our red
blood cells are replaced every hour.
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facts...
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