Billionaire Elon Musk, while speaking on the 'In Good Company' podcast, said, "Most PhD theses are useless." "If...you look at...how many PhDs are created every year and how many of those papers are...used in anything...then objectively most PhD theses have very low utility...because nobody uses them," he said. "Once in a while, you get something spectacular but it's...rare," he added.