Two events, simultaneous for one observer, may not be simultaneous for another observer if the observers are completely shitfaced.
Guy 1: "Fuck, man; I swear that night went down so differently in my head."
Guy 2: "Yeah, you were pretty much just dancing around while throwing up all over those girls and talking about how awesome you felt."
Guy 1: "Jose Cuervo's Theory of Relativity is a bitch."
A theory which states that space and time are actually a four-dimensional continuum known as "spacetime", and that gravity is a manifestation of the curvature of the geometry of this four-dimensional spacetime. General Relativity explains the gravitational bending of starlight, how gravity slows down the flow of time, predicts the existence of blackholes, and even predicts the expansion of the universe. The theory was formulated by Albert Einstein in order to incorporate gravity into his theory of relativity.
The famouseclipse experiment of 1919 confirmed Einstein's prediction that light rays would bend in a gravitational field, according to his theory of general relativity.
Formally known as the Theory of Special Relativity, formulated by Albert Einstein in 1905.
Deals with the perception of time and distance by observers in different frames of reference which are moving with respect to each other. An observer in one frame perceives that time is slower and distances are shorter in a different frame.
Also postulates that the speed of light is perceived to be the same in every frame of reference, and that no form of matter or energy can travel faster than light.
Relativity is the feeling that time slows down that you get when you're around your relatives.