Steve Wozniak Credit: invent.org

Steve Jobs and Steve Wozniak invented the first ready-made personal computer. Wozniak's engineering and Jobs added marketing, the two started the Apple computer company.

Wozniak was 18, Jobs only 13 when they met. The pair put their electronics and inventing talents to work making unusual devices. A few years later they purchased an inexpensive microprocessor for building a computer. The first computer was simple and came without memory, a power supply or even a keyboard, it was very reliable. Jobs and Wozniak decided on a name that would be good for the product's design and use: the Apple.

Steve Jobs Credit: invent.org

Jobs believed in bringing computer technology to everyone. Jobs and Wozniak started a company in 1977 to build and distribute their invention. In a real life hard to believe success story, their company began in a garage.

To pay for their work, Jobs sold his Volkswagen van and Wozniak sold his programmable calculator to raise money. Weeks later, Jobs secured the company's first sale: 50 Apple I computers at $666 each.

In a few short years, Apple was listed in the Fortune 500, becoming the youngest firm on this list.