美國總統歐巴馬任職期間頭髮明顯變白，圖左為2010年的歐巴馬，圖右為2015年的歐巴馬。（圖左取自Barack Obama臉書網頁；右取自President Obama臉書網頁）
歐巴馬8年白宮歲月白了頭 政績難評斷[影] | 國際 | 中央社即時新聞 CNA NEWS
President Obama said he had "gained a brother" in Vice-President Joe Biden
Obama speech: Democracy needs you, says outgoing president - BBC News
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Obama hugs Michelle Obama as his daugther Malia watched on. Photo: AAP
The outgoing president has made his final speech in office.
Barack Obama thanked his wife Michelle in an emotional speech. Photo: AAP
Barack Obama leaving the White House to go to Chicago for the speech.
Barack Obama delivers farewell address in Chicago - Yahoo New Zealand
President Barack Obama waves as he is joined by First Lady Michelle Obama and daughter Malia Obama after giving his presidential farewell address at McCormick Place in Chicago, Tuesday, January 10, 2017. (Photo by Nam Y. Huh/AP Photo)
The Day in Photos – January 11, 2017