https://www.quora.com/What-is-the-difference-between-Special-relativity-and-General-relativity
https://science.howstuffworks.com/science-vs-myth/everyday-myths/what-is-relativity1.htm
https://www.google.ca/search?ei=N4qPW67FN9CAk-4P0sSL4AI&q=general+relativity+vs+special+relativity&oq=general+relativity+vs+&gs_l=psy-ab.1.0.0l3j0i22i30k1l7.1013.2571.0.6121.4.4.0.0.0.0.76.279.4.4.0....0...1c.1.64.psy-ab..0.4.277...0i67k1.0.MtqCcJo3p9k
https://en.wikiversity.org/wiki/Theory_of_relativity/General_relativity
https://en.wikipedia.org/wiki/General_relativity
