Alexander Graham Bell is best known for the telephone, but he thought his light-based calling system, the photophone was way more important... so much so that he even tried to name his daughter Photophone Bell. Plus: for World Bicycle Day, the story of a Japanese company that let customers order a special set of socks that would be knitted by a bicycle-powered knitting machine.
Photophone: How Alexander Graham Bell Transmitted Sound by Sunlight (Amusing Planet)
Japanese Factory Lets You Knit Your Own Socks by Riding a Bicycle (Oddity Central)
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