Making a wheel isn't hard. You cut a tree and core it, add an axle and cap times two and you have a cart. Tame a horse, and you have transportation. People say

Making a wheel isn't hard. You cut a tree and core it, add an axle and cap times two and you have a cart. Tame a horse, and you have transportation. People saying its easy isn't taking into consideration that this is knowledge that took a really long time to figure out and effectively pass on. Knowing that rubbing two of the right sticks together for long enough will produce friction that can lead to enough heat for a fire isn't something that a person with no knowledge easily comes up with by themselves.