Guyger witness arrest, Thunberg on oil pipelines, Oprah donates to Morehouse

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One person is under arrest and two are wanted in the murder of a key witness in the Amber Guyger trial. Teen activist Greta Thunberg visited American Indian reservations in the Dakotas to talk about oil pipelines. Oprah Winfrey made a surprise, historic donation to Morehouse College.