Science & Technology Q&A for Kids (and others) [January 27, 2023]

Stephen Wolfram answers general questions from his viewers about science and technology as part of an unscripted livestream series, also available on YouTube here: https://wolfr.am/youtube-sw-qa Questions include: Do you think it's possible to sustain life on Mars? How far into the future do you see this happening? - Maybe biological switches would change everything for a biological machine. - Could you explain the fundamental principles of biology? - Aren't neurons the biological analog of switches? - Can machine learning help solve inverse scattering problems where the forward scattering problem is highly nonlinear? - How do x-rays work to see only the bones and ignore skin? - I think bone opacity also comes down to water contents (there is just more water in tissue). - Can those x-rays be used for automatic detection of changes within the molecule structure of crystallized solids as well? - Do you think ecology will play an important role in understanding molecular computation? - Ecology is a complex system. Physics is easy: just analyze a single particle's or body's motion. Ecology has vast interconnections and mechanisms.