Celebrated annually on October 23 from 6:02 a.m. to 6:02 p.m., Mole Day commemorates "Avogadro's Number": 6.02 x 10 23. This number--called a mole--is a basic measuring unit in chemistry. Mole Day ...

Today, chemistry students and nerds everywhere celebrate Mole Day with stuffed animals, cakes, t-shirts and a whole lot of puns and bad jokes. In this case, a mole isn't referring to the cute ...