"The Meaning of Relativity"

"The Meaning of Relativity" is a book by Albert Einstein that explains his groundbreaking theory of relativity. At its core, it shows that space and time are woven into a single fabric called spacetime, and that their structure depends on motion and gravity. This means that measurements of time, length, and even mass can vary for observers moving at different speeds or near massive objects. Einstein's insights revolutionized our understanding of the universe, revealing that what we perceive as absolute may actually be relative, depending on the observer's frame of reference.