Once again, I apologize if this topic has been done before but I don't really want to go through the back pages to see if it has. If it has, just delete this or something. I was wondering what other people felt to be the greatest or most influential inventions and developments of mankind's history. We can go ahead and bar things like the wheel, fire, and the written word because they are no-brainers. I would nominate penicillian as the greatest invention as the number of lives it has saved is astronomical. Not only did it save lives in itself, it also jump started modern day medicines and pharmaceuticals. The most influential invention of all time could easily be the gun. It has won and lost wars, conquered territory, provided food, provided protection, provided controversy and has obsessed man's mind since its appearance.