Steve Hall’s chemistry class at Houston High School, above,
celebrates Mole Day every year by making cakes that look like
moles. Scientist Amadeo Avogadro discovered the special number,
6.022 x 1023, that identifies how many atoms are in 12 grams of
carbon, which he named a mole. Mole Day is celebrated from 6:02
a.m. to 6:02 p.m. on Oct. 23. At left, Allie Eby, a senior at
Houston High School, shows off her Mole Day cake in chemistry
class. (KATIE JENSEN/Houston High School)