A decent explanation of the concept of time as the fourth dimension. The author discusses Einstein's theory of special relativity and the idea of space-time.

This article provides a quick introduction to special relativity.

A historical approach to special relativity, giving all the events and names in the history of discovery of special relativity. Many links to these individuals.

A detailed discussion of the nature of light, how it can travel through a vacuum, and how the speed of light is affected when light travels through a medium.

Japanese theoretical physicist Sin-Itiro Tomonaga resolved key problems with the theory of quantum electrodynamics (QED) developed by Paul Dirac in the late 1920s through the use of a mathematical technique he referred to as...

Read about the life and work of Albert Einstein, including details from his childhood and what he said about life just before he died.