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 ...

NCW occurs annually during the third week of October, typically the same week as Mole Day. In 1986, George Pimentel, then ACS president, had an idea to better educate the public about the crucial role ...