Uploaded January 2016 | Updated September 2026, 1 week ago

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This is the comment responses video for my 3-video series on Relativity. Lots of great questions!

All 3 Parts in 1 Video: youtu.be/a205YJsbBSQ
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VIDEO ANNOTATIONS

What the HECK is Light?!
youtu.be/m2-UJAEJzcc

Why is Time Relative?
youtu.be/TzupkDwOXEM

Basic FAQs about Black Holes:
youtu.be/ACCeFVeT984

Comment Responses: Variety Pack
youtu.be/KAmmb-4Ov40
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LINKS TO COMMENTS

Brain Hurt - KnowBuddies:
youtube.com/watch?v=qD9idUQG7ng&lc=z13cw1vhik3mz1s5o04cd1dagkfucp0jppg0k

Brain Hurt - Ghazi Sarhan:
youtube.com/watch?v=qD9idUQG7ng&lc=z12actkjizjgfhul523kfpwqcmjtvtt0e

Brain Hurt - Jovan Janakievski:
youtube.com/watch?v=qD9idUQG7ng&lc=z12cx5zr4qf4e1dc323kcrbgkkrqdhaoo04

SOL Constant - Spencer Larsen:
youtube.com/watch?v=S9Bsvh2nxF0&lc=z12rhfzphkjryxaib04ci3ja1mmhvxaxjyk0k

SOL Symbol - Randy Hukle:
youtube.com/watch?v=S9Bsvh2nxF0&lc=z12uvrwhfxydzx1x304cgbsjhyyrcbwqoz00k

Absolute Reference Frame - Daniel Skiba:
youtube.com/watch?v=S9Bsvh2nxF0&lc=z134e3mxjzakdrw4t04cffxbtrumv5q5ros0k

Spacetime Confusion - NEWKNOWLEDGE:
youtube.com/watch?v=0GNdyi3NatU&lc=z133jlmplw22zztjo04cjpzisy3vjlvqi0s

Time Axis - Leo Tan:
youtube.com/watch?v=qD9idUQG7ng&lc=z124vxgyuuuddtpse23hchuxxuikilyq004

Upside Down - xboxgamer550:
youtube.com/watch?v=S9Bsvh2nxF0&lc=z12qcrdosqmnutom523hdfaqbvv4ip4eb

Geodesics - Pirate Persian:
youtube.com/watch?v=qD9idUQG7ng&lc=z130uxt4hkfberq3f23djxz5smzjv302u

Time Curvature - Daniel Skiba:
youtube.com/watch?v=qD9idUQG7ng&lc=z13ncz5jqpzgthjhc04cffxbtrumv5q5ros0k

Coin Drop - ov3rk1ll87:
youtube.com/watch?v=qD9idUQG7ng&lc=z13qtx2aiv24fjgg004ce5iwpmelftq5lf0

Inertial vs Gravitational Mass - William Wood:
youtube.com/watch?v=S9Bsvh2nxF0&lc=z13wsdr5tyr0ftcns224x5e41knajjq0b

Energy not Mass - Mad Genius:
youtube.com/watch?v=qD9idUQG7ng&lc=z124vv0b1nmnxlzy504cfb3h1leiz104xr00k

Mass Equals Curvature? - Dave Long:
youtube.com/watch?v=qD9idUQG7ng&lc=z13pzflq5t2tudrah04cfluzhkzhirqyavs0k

QFT - lebron abdourahmane:
youtube.com/watch?v=qD9idUQG7ng&lc=z13oh5xgjorkyzu0p23axd24bkezff1xl04

QFT - Alexander Dokukin:
youtube.com/watch?v=qD9idUQG7ng&lc=z13pyvibeuu3htqw404cgtnwirbpxziwuy00k

QFT - Mau365PP:
youtube.com/watch?v=qD9idUQG7ng&lc=z131f5qqns2six3gi04chz1rrnqbhhzhw1s

QFT - Pirate Persian:
youtube.com/watch?v=qD9idUQG7ng&lc=z120dfvhhlq3ipx0u23djxz5smzjv302u
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EXTRA INFO LINKS

PBS Space Time on Mass:
youtu.be/gSKzgpt4HBU

Wave Equation:
http://hyperphysics.phy-astr.gsu.edu/hbase/waves/waveq.html
en.wikipedia.org/wiki/Wave_equation
en.wikipedia.org/wiki/Electromagnetic_wave_equation
en.wikipedia.org/wiki/Vacuum_permittivity
en.wikipedia.org/wiki/Vacuum_permeability

Lorentz Transformations:
http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/ltrans.html
en.wikipedia.org/wiki/Lorentz_transformation
en.wikipedia.org/wiki/History_of_Lorentz_transformations

Stress-Energy Tensor:
en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor

Quantum Field Theory (QFT):
hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html
en.wikipedia.org/wiki/Quantum_field_theory
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IMAGE CREDITS

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Cookie Monster:
https://i.ytimg.com/vi/SxDpW8kiBeM/maxresdefault.jpg

Gravitational Lensing:
commons.wikimedia.org/wiki/File:Lensshoe_hubble.jpg
apod.nasa.gov/apod/ap111221.html

Stress-Energy Tensor:
commons.wikimedia.org/wiki/File:StressEnergyTensor.svg