Photo: NASA/JPL-Caltech/Malin Space Science Systems

I love the little details coming out about the Mars Curiosity Rover. For example, this one: The Penny on Curiosity’s on-board calibration target is a 1909 Lincoln Penny and serves several significant purposes. Primarily, it is used as a reference item to compare sizes of things in the camera’s frame. Secondly, it is culturally significant because the 1909 Penny is the first year Lincoln pennies were minted and also the centennial of Lincoln’s birth.