The Einstein Theory of Relativity A Concise Statement

by Hendrik Antoon Lorentz

Einstein supposes that space is Euclidean where it is sufficiently remote from matter, but that the presence of matter causes it to become slightly non-Euclidean—the more matter there is in the neighborhood, the more space will depart from Euclid.

In some ways our age is not a good one to live in, but for those who are interested in physics there are great compensations.