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7 Nov 2009
The 'standard metre' is defined as 'the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second'. A very stable helium-neon laser kept at the National Physical Laboratory (NPL) in Teddington is used to provide the light source for the UK's standard metre.
When glass breaks, the cracks move faster than 3,000 miles per hour. To photograph the event, a camera must shoot at a millionth of a second!
In 1997 the US Department of Education released the Riley report which found that 83% of high school students who took algebra and geometry courses went on to college, more than double the rate (36%) of students who did not take these courses.
The mastermind behind the Soviet hydrogen bomb was the physicist Andrei Sakharov, later known as a human rights campaigner and winner of the Nobel Peace Prize.
Ancient Greek mathematician Pythagoras held that there was a precise mathematical formula for the perfect face. In order for someone to be considered 'beautiful', the ratio of the width of the mouth : width of the nose, and width of cheekbones : width of mouth should be 1.618 : 1.
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