On Monday, August 21st, the continental US will experience its first total solar eclipse since 1979. And to get the country prepared, the Postal Service is releasing a heat-reactive commemorative stamp. The stamp is printed using thermochromic ink, and when rubbed using fingers or thumbs will react to body heat, changing from an image of a total solar eclipse to a picture of the Moon. And, if you’re someone who loves to get your astronomical news from stamps, the back of the will also show a map of where to best view the eclipse.
If you’ve forgotten your high school science lessons, a total solar eclipse happens when the Moon moves between the Sun and the Earth, blocking out the former’s light. The Moon casts a shadow that moves across...
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