[Helianthus16]

Bleh. The moment you start thinking "one of the most powerful and off putting military advantages that could have been deployed, in either Ancient, or Renaissance times, would have been hot air balloons." is the moment you start thinking 'What if sharks had lasers?"

The breathless "and then I thought"s and stupid hypotheticals: "How would the technological arc of the ancient world have been changed if Archimedes, and not Edison, had invented the phonograph?" are just another series of what ifs.

The universe didn't fucking happen that way. Archimedes doesn't have access to those ideas. You can't just wonder what would have happened if people had discovered the internal combustion engine in the bronze age, because that question is meaningless.

[nitrogen]

The entire genre of steampunk is devoted to asking the "What If?" of alternate technological history. Clearly the question is slightly less than meaningless. Understanding the history of technology and why certain things did or did not happen can help us to optimize our societal approach to technology and progress in the future.

[Vivtek]

Clearly trains can't go at speeds approaching that of light, so Einstein's Gedankenexperiment is meaningless.