"Which Way Is Down?"
Excellent video by Vsauce, as always
About gravity, weight, forces, etc
"There is no gravity" -- Einstein
"Space-time grips mass, telling it how to move ; mass grips space-time, telling it how to curve" -- John Wheeler
"The law of cosmic laziness: everything is naturally steered to where time is slowest" -- Bertrand Russell
Which Way Is Down?