Electronic grade silicon must be at least is 99.9999999% pure. Also referred to as nine-nines or 9N, this level of purity means that only one in a billion atoms is allowed to be something other than silicon.
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Rule 5: Monday
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Rule 5: Sunday
Week-End
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According to the Guinness World Records, the tallest sandcastle ever made was constructed in Connecticut, USA, in May 2011. It was 11.53 m (37 ft 10 in) tall.
Rule 5: Saturday
Saturday Siren
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Blue LEDs are being used in refrigerators to keep food fresh as they have a strong anti-bacterial effect.
Rule 5: Friday
Frisky Friday
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If we were to look at the sky with a radio telescope tuned to 408 MHz, the sky would appear radically different from what we see in visible light. Instead of seeing point-like stars, we would see distant pulsars, star-forming regions, and supernova remnants would dominate the night sky.
Sonoran Conservative 