Stephen Wolfram answers audience questions about physics and astronomy as part of an ongoing livestream Q&A series for kids (and others).

Questions include: How do windmills generate energy? - Why can't we see all light? - Why does space never end? - How did earth evolve? - What is heat? - Do magnets work in space?

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