Of particular note was my friend Dan presented a side-project he did using rex and racc (Ruby versions of lex and yacc) to create a parser and validator for math equations written in LaTeX on Road Sign Math. This was pretty cool. He hacked it up quickly and solved most of the hard problems. He got to the point so he can evaluate that "3 \times \sqrt{4} = 6" is a valid statement. It will be a nice thing to wrap into Road Sign Math 3.0 when the time is right.