This morning, Prof. Stephen Hawking passed away. A great mind, locked in a destroyed body, has returned to the universe, which he had explained to us in his own incomparable way. Ironically, he closed the circle of his life on a pi-day.
Rest in peace, Professor Hawking
The University of Cambridge about Stephen Hawking
Prof. Harald Lesch: epitaph for Prof. Hawking
Stephen Hawking himself (I took this video from the youtube-channel of Cambridge University):