The long-term impact of any human activity is so much more than what is written in a history book somewhere. A history book is an enormously compressed, somewha

The long-term impact of any human activity is so much more than what is written in a history book somewhere. A history book is an enormously compressed, somewhat distorted depiction of human experience. Only a very small sliver of the actual fiber of human culture, achievement, and experience across time is recorded in this way. Yet all of these things are still happening, and they form the substrate upon which the events that are actually written down can take place. To use your example of the Manhattan project: only 10 people may be remembered in books, but they certainly would have never completed the project by themselves. The contributions of those other thousands of individuals was vital to the project's success. If they didn't exist, it's not a guarantee that you could have replaced all of them -- the project may have simply failed.