[Stalker61]

It was just a guess Acid, but take for instance making steel. You have to extract the ore from the earth using your bare hands or a piece of wood, start a fire, melt the ore, mold the steel and so on. Once this process is done things will progress quicker since you now have "a steel tool" to work with. Soon, things will start moving rather quickly. Don't forget you also have 5 billion people, all with the knowledge they have today, working together.