A Hungarian journalist named Laszlo Biro invented the first ballpoint pen in 1938. Biro had noticed that the ink used in newspaper printing dried quickly, leaving the paper smudge-free, so he decided to create a pen using the same type of ink. But the thicker ink wouldn't flow from a regular pen nib. Biro had to devise a new type of point. He did so by fitting his pen with a tiny ball bearing in its tip. As the pen moved along the paper, the ball rotated, picking up ink from the ink cartridge and leaving it on the paper.

thoughtco.com

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