 "The Weapon Too Dreadful to Use" was the eleventh story written by Asimov, and the second to be published.The people of Earth have colonised Venus, despite the intelligent species native to the planet, who are treated as inferiors with no rights (reminiscent of apartheid and Jim Crow laws on Earth).One of the Venusians shows his Earthman friend the ruins of an ancient city, where they discover details of an ancient weapon, apparently abandoned millennia before as being too dreadful to actually use.