Pioneering astronomer Annie Jump Canon invented the modern system of stellar classification. To honor her, the US Mint has created a $1 American Innovation coin featuring Canon's silhouette and a spray of stars. On Nov. 11th, the students of Earth to Sky Calculus flew some to the stratosphere, 111,221 feet above the Sierra Nevada mountains of central California.
 
The students are selling the coins to support their cosmic ray ballooning program. Each roll contains 25 one dollar coins with uncirculated finishes. Canon is shown on one side, and the Statue of Liberty on the other. Individual coins make great Christmas stocking stuffers for young scientists--or give the whole roll as a special gift. Each roll comes with a greeting card showing the coins in flight.