■Class discussion: What do you think is the greatest threat to humanity? Why? Are you optimistic or pessimistic about the future? Why? How could we avoid the threats Hawking talks about? What is the ultimate fate of the Earth? Hawking is famous for his work on black holes, cosmology and quantum mechanics. Does his brilliance in those fields qualify him to make predictions about the future? Why or why not? How much do you trust science and scientists?
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