Authors:

When a blind beetle crawls over the surface of a globe he doesn't notice that the track he has covered is curved. I was lucky enough to have spotted it.

Attributed in "Albert Einstein: A Documentary Biography" by Carl Seelig, (p. 80), 1956.
When a blind beetle crawls over the surface of a globe he doesn't notice that the track he has covered is curved. I was lucky enough to have spotted it.