In 1938, László Bíró noticed newspaper ink dried instantly while his fountain pen smudged, and this led to the creation of the modern ballpoint pen

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https://timesofindia.indiatimes.com/life-style/spotlight/in-1938-lszl-br-noticed-newspaper-ink-dried-instantly-while-his-fountain-pen-smudged-and-this-led-to-the-creation-of-the-modern-ballpoint-pen/articleshow/130849818.cms

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In 1938, László Bíró noticed newspaper ink dried instantly while his fountain pen smudged, and this led to the creation of the modern ballpoint pen | - The Times of India

Discover how László Bíró's simple observation of ink differences in 1938 led to the invention of the modern ballpoint pen, transforming writing forever.