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 is the reason behind an eclipse? How does it happen? - Can we still be wrong about the position of Earth and its motion, or is that debate over? - Earth's moon is important for the tides and for the world climate. - Weren't there experiments reflecting lasers off the Moon before the Apollo missions? - Do other planets experience eclipses?