WATCH: The U.S. Postal service just debuted their new solar eclipse stamps that change color by the heat of your finger and it's pretty much the coolest stamp ever.
The heat from your finger transforms the dark moon stamp into a full moon.
These eclipse stamps won't be around forever so dash to your local post office if you want these stamps.
Related| NASA shows when and where the next total solar eclipse is happening, the first in 40 years.