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Henry Cavendish: The Genius Who Weighed the Earth From a Shed

Imagine being one of the wealthiest people in 18th-century Britain, possessing a mind so advanced you can literally weigh the planet, yet being so terrified of human contact that you build a secret back staircase just to avoid your own housekeeper. This is the profound paradox of Henry Cavendish, the reclusive aristocrat whose discoveries shaped the modern world while half his genius stayed buried in unpublished notebooks.

This episode dives into the life of a man who funded bespoke precision instruments with limitless wealth, isolated hydrogen, proved water was not an element, and measured the density of the Earth from a garden shed. We also explore his agonizing social isolation, the posthumous discoveries that revealed he had anticipated entire fields of physics, and what his life means for how science gets done and credited.

His 1766 paper recognized hydrogen as a distinct element, and by burning it he proved water is made of two parts hydrogen to one part oxygen
He documented a stubborn leftover gas bubble in air, isolating argon a full century before it was officially discovered in the 1890s
The Cavendish experiment used a delicate torsion balance, watched through telescopes from outside, to calculate Earth's density at 5.48 times that of water, within 1% of the modern figure
He communicated with servants by written notes and was so shy that dinner guests were instructed to speak as if into vacancy
His private notebooks, opened by Maxwell in 1879, showed he had anticipated Ohm's Law (calibrated by shocking himself), Coulomb's Law, and a mechanical theory of heat

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