Relativity: The Special & the General Theory: A Popular Exposition, 3rd ed.

"Relativity: The Special & the General Theory" by Albert Einstein is a popular science book published in German in 1916. Einstein sets out to explain his revolutionary theories of relativity to readers without advanced mathematical training. Through thought experiments involving trains, light beams, and moving observers, he reveals how space and time are not absolute but relative to the observer's motion. The book challenges fundamental assumptions about simultaneity, introduces the constant speed of light, and explores the Lorentz transformation and time dilation, ultimately uniting the laws of mass and energy conservation. (This is an automatically generated summary.)