Mole Day is an unofficial holiday celebrated among chemists and chemistry students on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from Avogadro's number, which is approximately 6.02×1023, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.
Mole Day originated in an article in The Science Teacher in the early 1980s. Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.
Many high schools around the United States, South Africa, Australia and in Canada celebrate Mole Day as a way to get their students interested in chemistry, with various activities often related to chemistry or moles.
Read more about Mole Day: Themes, Alternate Observances
Famous quotes containing the words mole and/or day:
“On her left breast
A mole cinque-spotted, like the crimson drops
I’ th’ bottom of a cowslip.”
—William Shakespeare (1564–1616)
“This is the day when people reciprocally offer, and receive, the kindest and the warmest wishes, though, in general, without meaning them on one side, or believing them on the other. They are formed by the head, in compliance with custom, though disavowed by the heart, in consequence of nature.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)