Thomas Young was a polymath of such extraordinary breadth that he is often called 'The Last Man Who Knew Everything.' In physics, his 'double-slit experiment' provided definitive proof of the wave nature of light, challenging Newton’s particle theory. In medicine, he explained how the eye focuses and was the first to describe astigmatism. Young was also a brilliant linguist; he played a crucial role in deciphering the Rosetta Stone, identifying the phonetic nature of several hieroglyphs. He even made contributions to material science with 'Young's Modulus,' a measure of elasticity. His ability to master diverse fields remains one of the greatest displays of intellectual versatility in history.