Once while Einstein was working on the equations for general relativity, which would take him eight years to complete, he went mountain-climbing with the French-Polish chemist Marie Curie.

When you think of groundbreaking discoveries in science, the names of Albert Einstein, Marie Curie or Isaac Newton often come ...

and his wife Marie, according to the RTBF. "Please Albert, smile" As Einstein took his seat in the vehicle, the photographer Arthur Sasse rushed up to him, begging him to smile. The result?