George Boole

George Boole (1815–1864) worked out the mathematics that runs inside every computer chip — about 85 years before the first computer existed, and without the faintest idea one ever would. A largely self-taught shoemaker's son from Lincoln who became a professor by sheer brilliance, Boole set out to do something that sounded almost mystical: reduce the laws of human thought to algebra.

Turning logic into algebra

In his 1854 book The Laws of Thought, Boole showed that logical statements — true or false, AND, OR, NOT — obey their own tidy algebra, with 1 for true and 0 for false. This Boolean algebra, with its truth tables, is the exact language of the logic gates etched by the billion into every processor. Every time your computer makes a decision, it is doing Boole's algebra at a speed he could never have imagined.

From pure thought to the search bar

Boole's algebra didn't stay in the realm of pure logic. Type cats AND dogs into a search engine, or filter a spreadsheet with price < 20 OR sale = true, and you are speaking Boolean — the same AND/OR/NOT he formalised in 1854. Sadly he never saw any of it: Boole died at 49 after walking to a lecture through cold rain, then (on the advice of his wife, who believed in "like cures like") being wrapped in wet blankets. A brilliant, gentle man undone by Victorian medicine — whose two lines of algebra now underpin the entire digital age.