Lucy Hawkings (right) touches her father Stephen Hawking (left) as they give a lecture entitled “Why We Should Go Into Space” during the 2008 “50 Years of NASA” lecture series at George Washington University in Washington, DC.

Lucy Hawkings (right) touches her father Stephen Hawking (left) as they give a lecture entitled “Why We Should Go Into Space” during the 2008 “50 Years of NASA” lecture series at George Washington University in Washington, DC.