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USPS solar eclipse stamps use body heat to reveal the moon
Engadget 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 … Breaking: New solar eclipse stamp does something no other stamp can Stamps change with heat to create total eclipse of the mail New stamp celebrates upcoming solar eclipse with heat-reactive transformation |
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