Question: Who was the director of the lab that designed bombs for the project that used mass spectrometers to separate isotopes of uranium?
Sentence (from "History of mass spectrometry"): The first such discovery was with the element neon, which was shown by mass spectrometry to have at least two stable isotopes: Ne (neon with 10 protons and 10 neutrons) and Ne (neon with 10 protons and 12 neutrons).
Relevant evidence: No