Stephen Wolfram answers general questions from his viewers about science and technology as part of an unscripted livestream series.

Is there a physical principle that governs Moore's law? Why is there so much available computation? - If F=ma, and photons have a mass of 0, how can light sails work? Do photons have some properties of having mass? - As of right now, what do you anticipate will be the outcome of the Wolfram Physics Project? What practical applications will it have? - What is more difficult for you to create things or to explain how they work to others? - Has your physics project shed any light on the protein folding problem? If you squint right, there seems to be a connection. - How does black hole merging work? - Is there any theory about what type of particles a potential black hole would be made off? - What's your experience and opinion about Alchemy and is it possible to incorporate a modernized version of it into Mathematica? - What do we know about the nature of time travel? Will time machines as depicted in science fiction stories remain fiction for the foreseeable future? - Can there be architectures that do not seem to make sense that simply have higher order of complexity not dependent on binary arithmetic circuits? That will be used in future? - I am currently in high school, what advice would you give to an aspiring mathematician?

See the full Q&A video playlist: https://wolfr.am/youtube-sw-qa