What's the Point of a Communication Satellite?

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: What are the biggest differences you notice about how physicists think vs. how mathematicians think? - A typical text file is a few KB, a typical audio file is a few MB, a typical video file is a few GB. What would a typical file size be for smell, taste and touch? Is there a reason why a quantitative change leads to a qualitative change? - Do you think there is a market for small rockets in Europe? - Would those LEO satellites block out sunlight? - If we keep getting more precision with atomic clocks, can we use a set of well placed atomic clocks to use gravity's effects on time to create a 3D map of some region of space (say to spy in a room, or see into the ground) to make out things with a centimeter feature?