What Is A Mole?
No, it's not the furry little burrowing rodent with the star-shaped nose, from 'Wind In The Willows'... In chemistry, a mole is strictly defined as the number of particles of a pure material equal to the number of atoms in exactly 12 grams of carbon-12. This…
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How Far Are The Seven Sisters?
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What is Herd Immunity?
No vaccine is 100% effective and usually does not work in 5% of those immunized. In addition, another 5% lose…