File:Barack Obama greets Burton Richter and Mildred Dresselhaus

President Barack Obama awards Dr. Mark Humayun of the University

Obama Honors Burton Richter with Prestigious Enrico Fermi Award

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

President Barack Obama, right, and Dr. Jill Biden, left, wife of

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

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

Burton richter hi-res stock photography and images - Alamy

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

Obama honors Mildred Dresselhaus with Enrico Fermi Award

Timeline of Events: 2012

Us president obama wife michelle hi-res stock photography and

Category:White House in May 2012 - Wikimedia Commons

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President Barack Obama awards Dr. Stanley Falkow of Stanford