I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Later in life, Tesla made claims concerning a "teleforce" weapon after studying the Van de Graaff generator. The press variably referred to it as a "peace ray" or death ray. Tesla described the weapon as capable of being used against ground-based infantry or for anti-aircraft purposes."? 

Who invented the name death ray?