A French Inventor Once Proposed a Giant Mirror to Burn a Message on Mars

When we want to leave our mark on Mars today, we simply send over a few Rovers to roll around in its red soil. But 150 years ago, scientists had very different plans for contacting the planet, including one French inventor who wanted to use the refracted light of the sun to sear a welcoming message into the Martian…

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The Solar-Powered Fridge of 1937 Made Sunbeams Into Ice Cubes In 2 Hours

We often think of solar-powered devices as pretty new. But we've been harnessing the sun since long before the first practical solar cell was introduced back in 1954. For instance, in these solar-powered contraptions from a 1937 Popular Science film — including the amazing fridge that turned sunbeams into ice cubes in…