6 ideas
Breakthroughs almost never arrive as a single inventor's flash of genius; they emerge through incremental tinkering by many hands, each adding small improvements over years or decades. The lone-genius narrative is a retrospective simplification that erases the messy, collective, trial-and-error process that actually produced the result.
Major inventions are typically arrived at by multiple people independently and nearly simultaneously, because they become inevitable once the surrounding knowledge and enabling technologies mature. The light bulb had roughly 23 inventors and the telephone two filings on the same day — proving the idea was 'ripe' rather than the product of one mind.
Inventing something is the easy part; turning it into a reliable, affordable, widely adopted product is the hard, expensive, failure-prone work that defines innovation. Most credit goes to inventors, but the real value is created by those who make a technology practical and cheap enough for mass use.
An obscure ironmonger, not a credentialed scientist, built the first practical steam engine through hands-on experimentation, despite lacking the theoretical physics to explain it. Practical innovation often runs ahead of scientific understanding, with theory arriving to explain devices that already work.
Innovation flourishes where people are free to experiment, exchange ideas, and recombine technologies without permission, and it withers under heavy regulation, central planning, or monopoly control. Prosperity and openness create the surplus and the liberty that let trial-and-error proceed at scale.
New technologies arise primarily by combining existing ideas and tools in novel ways rather than by creating something from nothing — innovation is 'ideas having sex.' Denser networks of exchange therefore accelerate innovation, because more contact between ideas yields more fertile recombinations.