In his latest educational video, Our Narrow Slice, Michael of Vsauce discusses human history and the impact we have had in such a short amount of time.

He demonstrates this fact by explaining how much of our modern history overlaps, such as General Custer fighting in the Civil War while the Brooklyn Bridge was being built. 

For thousands of years, almost nothing changed. Only at the last sliver of human history has our world dramatically changed. For better or for worse.