Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric of space and time at the heart of Albert Einstein's theory of relativity.

Joshua Rapp Learn is an award-winning D.C.-based science journalist who frequently writes for Discover Magazine, covering topics about archaeology, wildlife, paleontology, space and other topics. View ...

University of Saskatchewan provides funding as a founding partner of The Conversation CA. University of Saskatchewan provides funding as a member of The Conversation CA-FR. Few ideas in modern science ...

This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to audio speakers. Oh, and without it we’d live in eternal darkness.