https://www.reuters.com/article/us-alphabet-google-research/google-fires-second-ai-ethics-leader-as-dispute-over-research-diversity-grows-idUSKBN2AJ2JA >Alphabet Inc's Google fired staff scientist Margaret Mitchell on Friday, they both said, a move that fanned company divisions on academic freedom and diversity that were on display since its December dismissal of AI ethics researcher Timnit Gebru.