The Formation of Galaxies and Nature's Signals

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: ​How do galaxies form? - Is it true that animals can sense earthquakes? How? Why can't humans? - ​​I always found it fascinating how birds pick up those fields to "get directions" on where to fly. - People with joint pain can often sense air pressure and humidity changes, and some develop a sense for when the weather will change as a result ("My knee hurts; the weather will change soon."). - What is the difference between speed and acceleration? - If energy is conserved, how we do we run out of it? - How do mutations or radiation effects affect biological evolution? - How size dependent is the universe? Could it be possible to create a mini-galaxy within a controlled environment here on Earth? - Is there fusion going on in a black hole?