In 1946, Albert Einstein stood in front of students at the oldest historically black college in the United States and decried the oppression of African Americans.
"There is separation of coloured people from white people in the United States. That separation is not a disease of coloured people. It is a disease of white people. I do not intend to be quiet about it," the Jewish scientist said during a commencement speech at Lincoln University in Pennsylvania.
But newly published private travel diaries reveal another side.
The Nobel-winning physicist harboured racist thoughts about those who did not look like him, said Ze'ev Rosenkranz, senior editor and assistant director of the Einstein Papers Project at the California Institute of Technology who edited The Travel Diaries of Albert Einstein.
The diaries cover a period from October 1922 to March 1923, when he and wife Elsa travelled by ship to the Mediterranean, Sri Lanka, China and Japan.