Are matter, mass, and time real? 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! null We know that mass is energy… but what is energy? And where did matter and time even come from? Matt begins to dive into these intricate topics by first examining what inertial mass is, how it relates to gravitational mass, and what it all means for mass as a fundamental property. The Speed of Light is NOT About Light https://www.youtube.com/watch?v=msVuCEs8Ydo The Real Meaning of E=mc² https://www.youtube.com/watch?v=Xo232kyTsO0 ______________________ COMMENTS: Caleb Limb https://www.youtube.com/watch?v=kixAljyfdqU Felix Feist https://www.youtube.com/watch?v=kixAljyfdqU deathbypowerpoint https://www.youtube.com/watch?v=kixAljyfdqU ______________________ FURTHER READING: Inertial Mass http://www.physlink.com/Education/AskExperts/ae305.cfm Equivalence Principle https://en.wikipedia.org/wiki/Equivalence_principle ______________________ Written and hosted by Matt O’Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)