No time to read Stephen Hawking's A Brief History of Time? In just two and a half minutes, Alok Jha explains why black holes are doomed to shrink into nothingness then explode with the energy of a million nuclear bombs, and rewinds to the big bang and the origin of the universe? 

QUESTIONS: 

1. Tell me about Stephen Hawking and his contribution to science. 

2. What do you know about the black hole?

3. Explain why Stephen Hawking our most famous scientist.