The United States Postal Service is no stranger to letting its nerd flag fly with special edition stamps. The latest in its space series is a little different, though. Rather than just showing off celestial bodies or NASA spacecraft, the new stamps are a tribute to the upcoming total solar eclipse that should occur August 21st. Press your finger to the stamp and your body heat will transform its black circle centerpiece into an image of our moon. Once the heat dies down, the stamp image goes back to black. While it's not as elaborate as you might think, this is something that's sure to make philatelics smile.