What applied science has [had] the potential to cause the greatest societal advance in human history?
Teleportation, as trips to the moon & mars took too long to... wait nevermind.
Damned time-travelers... :grumpy:
I thought that I had a trap set for the likes of you.
Anyhow, as the sign in Callahan's Cross-Time Saloon reads: "Time travelers, strictly cash."
Danger, a sign on the side of a van that reads "Free Candy for Time Travelers" isn't considered an elaborate trap. No matter what instruments of death are inside...