"If an astronaut traveled as fast as light his clock would stop completely."

"If two spaceships are in relative motion, an observer on each ship will measure the other ship as contracted slightly…"

"The great merit of Minkowski was to show that an absolute world could nevertheless be imagined, although it was a far…"

"A four dimensional continuum described by the co ordinates x1, x2, x3, x4, was called "world" by Minkowski, who also …"

"The discovery of Minkowski... is to be found... in the fact of his recognition that the four-dimensional space-time c…"

"For over 200 years the equations of motion enunciated by Newton were believed to describe nature correctly, and the f…"

"The impressions received by the two observers A0 and A would be alike in all respects. It would be impossible to deci…"

"Between 1968 and 2005 I’ve learned a lot about explaining special relativity. One pedagogical discovery has been espe…"

"Another thing I have learned since 1968 is that one should emphasize as early as possible that although objects movin…"

"There is no absolute time throughout the universe by which absolute simultaneity can be measured. Absolute simultanei…"