Have you ever wondered who is behind geometry's most fundamental truths? You guessed it: it is Euclid of Greece.

This article was originally published with the title “ Non-Euclidean Geometry before Euclid ” in Scientific American Magazine Vol. 221 No. 5 (November 1969), p. 87 doi:10.1038 ...

Euclid's first data release offers a breathtaking glimpse into our universe, revealing over 26 million galaxies and ...