Is it possible that gravity will remain distinct from the distinct from the other three forces, even when a quantum theory of gravity is established? I don't think one way or the other. There's something that smells right about string theory but it might eventually not be how nature works. In your first ama in 20 18, you call yourself a believer that technological progress is still in its beginning states. Can you talk about your reasons for thinking this, and whether your confidence has changed as various limits to industrial growth and stability become more evident? More generally, the modern era is a highly anomalous brief period in our species long history wouldn't one expect a system to revert back to the norm rather