Einstein Online English

Einstein Online English: "Welcome to Einstein-Online,
a website about Einstein's theories of relativity!
Elementary Einstein
Confused by curved spaces? Baffled by black holes? Then it's time to read our online introduction to relativity, Elementary Einstein!
Schwarzschild, LISA & Co.
Ready for more Einstein? Our Spotlights on relativity deal with selected topics in relativity - from modern research to age-old questions:
Journey into a black hole
Einstein and soap bubbles
Extra dimensions, and how to hide them
...and more!"