Science & Technology Q&A for Kids (and others) [September 17, 2021]

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: Since photons do not experience the passing of time, does that mean that all their physical properties, such as wavelength, are fixed throughout their lifespan? - Do you think that it's worth investing and attempting cryonic suspension as a way to continue living? - ​Why does time seem to speed up as we age? - How can one learn physics or math at a young age? (organizing your life, order of topics, your experience as a young physics enthusiast) - If the center of the earth is really hot lava like the sun, how come it isn't melting everything between us & it?