an electron accelerated to .9999999999999999999999999999999999999999999999999 9999999999999 times the speed of light would hit you with the same impa… - Lawrence M. Krauss

The Initial Mystery that attends any journey is: how did the traveler reach his starting point in the first place? — LOUISE BOGAN, Journey Around My Room

Now, since the time of Newton there had been a debate about whether light was a wave---that is, a traveling disturbance in some background medium---or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave.

I cannot overstress the importance of the fact that, once gravity is included in our considerations of nature, one is no longer free to define the total energy of a system arbitrarily, nor the fact that there are both positive and negative contributions to this energy…I say this because it have been argued that the statement that the average total Newtonian gravitational energy in a flat, expanding universe is arbitrary, and that any other balue would be just as good, but that scientists ‘define’ the zero point to argue against God. So claimed Dinesh D’Souza, anyway, in his debates with Christopher Hitchens on the existence of God.