rhathar writes "A 12 year old boy by the name of Jacob Barnett is a math genius. Mastering many college level astrophysics courses by the age of 8, he nows works on his most ambitious project to date: his own 'expanded version of Einstein's theory of relativity'." Link to Original Source
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"