Shannon Turned Every Message Into Measurable Bits

Before Claude Shannon, who worked at Bell Labs during World War II, information was not something science could measure. It arrived as a wired message, a picture, a block of prose, or a tune, each one its own kind of thing. The comparison used for him is to physics before Isaac Newton, when objects had inertia but no one had defined it for hard science.

His path to an answer ran through secret wartime work. Shannon was assigned to vet the math that let a scrambled message be decoded intact after it traveled. That job gave him a window into encoded speech, the transmission of information, and cryptography at the same time, a combination that may have existed nowhere else but Bell Labs at that moment.

Out of that window came a simplifying step. Shannon recognized that any message, whatever it meant and whoever sent or got it, could be boiled down to a string of simple yes-or-no choices. Bits, in his account, were information's fundamental unit. A love song and a battle order were different in meaning, but as information they were made of the same measurable stuff.

He published the idea in 1948 after eight years of scribbling, refining, and night work when he sensed he was onto something even more fundamental. The paper is now considered among the past century's most important science papers. It laid the theoretical foundation for the web, methods for shrinking files, methods for fixing transmission mistakes, digital phone networks, modern computers, and much of today's AI systems.

That is why the digital world can treat every kind of message the same way. Once information became bits, it could be counted, squeezed smaller, sent over long distances, and rebuilt correctly, which is what phones, computers, and networks do all day.