The invention of the transistor - and the later invention of the integrated circuit, which uses transistors - made it possible to have thousands, and eventually millions and billions of components on an area of a few square centimeters, making it possible to produce complicated circuits, and thus build lots of electronic devices, including modern computers.
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Mary Somerville was a Scottish mathematician and astronomer. She contributed many things to the mathematic world, but her invention of the commonly used variables for algebraic math is the most significant.
It was the invention and usage of a zero symbol
Because the Hindu-Arabic numeral system contained a zero symbol which made mathematical calculations a lot simpler than the Roman numeral system which didn't have a zero symbol.
The discovery of the cell was possible due to the invention of the microscope.
Do whatever you have to. Get your parents involved no matter what it is people will be open to your invention.