Edwin E. Slosson's Easy Lessons in Einstein is a classic introduction to the theory of relativity, written in a clear and accessible style. First published in 1920, it was one of the first books to make Einstein's groundbreaking ideas available to a general audience. Slosson uses vivid thought experiments and engaging analogies to explain the concepts of spacetime, gravity, time dilation, and length contraction. He also includes a short article by Einstein himself on the relationship between time, space, and gravitation.