Conmemoracion de la muerte de un genio y el natalicio de otro.
Stephen Hawking: Visionary physicist dies aged 76
https://en.wikipedia.org/wiki/Stephen_Hawking
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist[5] who developed the theory of relativity
https://en.wikipedia.org/wiki/Albert_Einstein