File:Barack Obama greets Burton Richter and Mildred Dresselhaus

File:Barack Obama greets Burton Richter and Mildred Dresselhaus

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President Barack Obama awards Dr. Mark Humayun of the University

President Barack Obama awards the 2010 Presidential Medal of

Obama Honors Burton Richter with Prestigious Enrico Fermi Award

278 Barack obama at the white house in 2012 Images: PICRYL

Barack obama oval office 2010 hi-res stock photography and images

President Barack Obama awards Dr. Stanley Falkow of Stanford

278 Barack obama at the white house in 2012 Images: PICRYL

Wife us president barack obama hi-res stock photography and images

Burton richter hi-res stock photography and images - Alamy

President Barack Obama, right, greets Buzz Aldrin, left, Michael

Award recipients hi-res stock photography and images - Alamy