5. The Steam Engine
1792 – Probably lead to the start of the industrial revolution at the turn of the following century.
4. The Printing Press
1450 – Single-handedly led commoners to overthrow governments in Europe. No longer did the masses have to listen to a Priest about the Bible, rather they would learn to read on their own and were able to interrupt themselves.
Late 19th Centry – Need we really say more?
BC – The first means of warmth and the basis for energy for years to come.
The wheel provided humanity with the ability to farm, which made us less nomadic and added to our ability to free up time and discover other great inventions.