0_Apprentice
I was sad to hear that Stephen Hawking had passed.
1_Wizard
Yes he was born 08/01/1942, he was just  76 years old
0_Apprentice
He sure lived a long time with whatever his disabling disease was. What is he best known for?
1_Wizard
His scientific work was a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction
0_Apprentice
Of course! He must have been really smart. 
1_Wizard
Yes, he sure was. It was shock you to know that he was the first to lay out theory of cosmology