Science & Technology Q&A for Kids (and others) [October 7, 2022]

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: Should we try to contact extraterrestrial beings by broadcasting signals into space, or is it too dangerous to reveal our location? - How do you tell if something is natural or artificial? - How far can an EMP from the human heart travel? - If I am on an object moving two-thirds of the speed of light moving towards another object that is moving two-thirds of the speed of light toward me, what would the object look like to me while on the first object? - Dogs can not understand mathematics; similarly, humans must be limited in their ability to grasp aspects of reality. Is our ability to understand upgradable? Would biological evolution, better brains or merging with AI allow us to break through our biology's limitations and become new "dogs who can understand mathematics"? - ​​I think that is no problem; the brain would just incorporate the new frequencies and we would see it like a new color. - Do we see more green in one eye and more red in the other eye or something? Is that how we perceive things in 3D?