László Bíró was a Hungarian-Argentinian inventor best known for creating the modern ballpoint pen. Born on September 29, 1899, in Budapest, Hungary, he initially worked as a journalist, which led him to seek a better writing instrument. Frustrated with fountain pens that smudged and required constant refilling, he designed a pen that used a tiny ball bearing to distribute ink evenly. In 1938, Bíró patented his invention and later moved to Argentina, where he continued to develop and promote the ballpoint pen. His design revolutionized writing instruments, making them more reliable and convenient. Today, the ballpoint pen is a staple in offices and schools worldwide.