Oddlet: Joseph Fourier · 1 min read
Sep 1, 2026
The Wrapping
The man whose equations run every JPEG, MP3, and MRI scan came back from Egypt convinced heat was the secret to staying alive — and wore several overcoats indoors, in summer, until it killed him.
Joseph Fourier came back from Egypt cold.
Three years under the Sahara sun rewired something in him, and the man who would one day write the equations that govern every JPEG, MP3, and MRI scan returned to Paris convinced that heat was the secret of staying alive. He kept his rooms sweltering year-round. He wore several large overcoats indoors. His friend Arago later wrote that he dressed as even travelers condemned to winter among the polar ice did not.
This was in summer.
Baron Larrey, Napoleon's chief surgeon, who had amputated thousands of limbs on battlefields from Aboukir to Borodino and was therefore not easily alarmed, came to see him, took stock of the temperature and the coats, and told him the regime would kill him. Fourier declined to stop.
He had a joke he liked to tell. If his friends ever subjected him, like an Egyptian mummy, to the operation of unwrapping, they would find for residue only a rather slender body underneath. Whether he understood he was describing himself is one of those questions you don't really want answered.
On 4 May 1830 he fell on a staircase in his overheated house and died twelve days later.
They buried him at Pere Lachaise, in a tomb covered in Egyptian motifs.
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- Wikipedia — Joseph Fourier — General biography covering dates, the Egyptian campaign, prefecture, scientific contributions, the 4 May 1830 stair fall, death on 16 May 1830, burial at Pere Lachaise.
- MacTutor History of Mathematics — Fourier biography — Detailed academic biography covering early life, arrest during the Terror, succeeding Lagrange, the Egyptian expedition, the 1807 heat memoir, the 1822 Theorie analytique de la chaleur.
- Encyclopedia.com — Baron Jean Baptiste Joseph Fourier — Notes Fourier's cold-sensitivity after Egypt, confinement to specially heated quarters, the 4 May 1830 stair fall, Cousin's and Arago's eulogies as primary sources, and modern myxedema/hypothyroidism hypothesis.
- New World Encyclopedia — Joseph Fourier — Covers rheumatism in later life, the heated-rooms habit, the 4 May 1830 fall, and intervention on behalf of Champollion.
- John D. Cook — Fourier's personal heat problem — Quotes The Physics Book: 'He was always so cold, even in the summer, that he wore several large overcoats.'
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