question: What did former student Tracy Hall invent as a BYU professor of chemistry and Director of Research ?
answer: a new type of diamond press , the tetrahedral press
turker_answer: Former student Tracy Hall invented a new type of diamond press , the tetrahedral press as a BYU professor of chemistry and Director of Research .
rule-based: Former student Tracy Hall invented a new type of diamond press , the tetrahedral press as a BYU professor of chemistry and Director of Research .