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What are… things? Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g Now that we’ve broken down our preconceived notions about mass and time, let’s redefine what they really are. Since we know that time is not a universal constant, what is? On this week’s Space Time, Matt defines causal order and explains how even though time may look different to multiple observers, it is the one concrete reality that we can all agree on. The True Nature of Matter and Mass https://www.youtube.com/watch?v=gSKzg... When Time Breaks Down https://www.youtube.com/watch?v=GguAN1_JouQ _____________________ FURTHER READING: Lorentz Transformation https://en.wikipedia.org/wiki/Lorentz_transformation _____________________ COMMENTS: Endre Kovács https://www.youtube.com/watch?v=GguAN1_JouQ&lc=z12phnyohlrag1l5g04cj3byypregxqwciw ectoplasm2369 https://www.youtube.com/watch?v=GguAN1_JouQ&lc=z12ftb25bu3xdpvkr23kxfvjnnz4x54mk BrunoJMR https://www.youtube.com/watch?v=GguAN1_JouQ&lc=z13cupk5ivbch53qm04ccjpwjq3jxhebbc0 ______________________ Written and hosted by Matt O’Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)