It was a man who worked for the British Post Office that created that first digital computer.
Tommy Flowers
Tommy Flowers' work was unsung due to the secrecy surrounding it. He designed and created the first electronic binary digital computer for Bletchley Park. Bletchley was the center for allied cryptography in WW2. He was assisted in it's design by Alan Turing, Turing was quite possibly the greatest mind of the 20th century.
The digital computer is not simply a box that sits on your desk and lets you surf the web and play video games. It is the ultimate tool, it amplifies the human mind and body. It will soon allow total manipulation at the atomic level (nanotechnology) and at the macro scale via automatons controlled by computers at our direction.
The nano scale abilities will deliver to us physical immortality. The macro scale abilities will deliver to us the control of everything you can see, the Earth, the Solar system...eventually the entire galaxy and beyond.
Once you control both the micro and macro world there simply is no limit.
This is why things such as Dyson Spheres are possible.