Billionaire hedge fund manager Bill Ackman threatened to sue Business Insider after the outlet published two articles that accused his wife, Neru Oxman, of plagiarism in her 2010 doctoral dissertation. Ackman said on Monday that Business Insider and its parent company, Axel Springer, “have tripled down on their false claims and defamation” after the outlet made plagiarism accusations against Oxman, a prominent designer and former MIT professor. “By complaint I mean lawsuit, to be clear,” Ackman added on X. Just hours earlier, Ackman said that Business Insider “is toast” in a post that included a scene with the quote “At...