Zircon with quartz from Cheyenne Canyon, ColoradoCourtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard
Take a 3-minute break and test your skills!
March 02, 2015
chatoyant Hear it
Having a changeable luster or color
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears