This makes it harder for young students to learn geometry because Euclidean geometry is more concrete and related to the «real world» than Cartesian Geometry. (weaponsofmassdeception.org)
The parallel postulate in Euclidean geometry states, for two dimensions, that given a line l and a point P not on l, there is exactly one line through P that does not intersect l, i.e., that is parallel to l. (sciencedaily.com)
Axioms are true in a model, but the physical universe is not a model for Euclidean geometry. (religion.blogs.cnn.com)