Some of the best inventions actually started out as accidents, and such is the case with the world’s first “Chia Pet” pen. Its creators were trying to create an eco-friendly alternative to printer ink ...
Most of the pens are made from wood that's at least three-quarter-inch by three-quarter-inch by 6 inches. He drills a hole through the center of two pieces, inserts and glues a brass tube to hold the ...
You’ve heard of disappearing ink, but this pen does the opposite—by creating illustrations with living ink, they only become visible after spending a few days in the sun. The secret behind this tricky ...
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