The picture was clicked on the occasion of the Nobel Prize winner's 72nd birthday party at Princeton University on March 14, 1951.

Einstein was so amused by this picture that he ordered several prints to give out to close friends.

Einstein penned the letter in reply to a two-page questionnaire submitted by Arthur Converse, a science teacher from Iowa.

A demon-faced Osama bin Laden doll that was created as part of a CIA programme to dissuade children from idolising the al-Qaeda chief has b...