This forum can use Latex and Youtube.

use the tex for latex (default black font, but overridable) or wtex for white latex

example of tex using

\color{red}{\large%20\large%20\sum_{i=1}^{\infty}P(i,U)%20=%201%20-%20P(0,U)%20=%201-%20e^{-U}}

example of tex using

\large%20\large%20\sum_{i=1}^{\infty}P(i,U)%20=%201%20-%20P(0,U)%20=%201-%20e^{-U}

You can barely see it because of the dark background

example of wtex using

\large%20\large%20\sum_{i=1}^{\infty}P(i,U)%20=%201%20-%20P(0,U)%20=%201-%20e^{-U}

use youtube by such using the final letters for example this is was the original youtube url

http://www.youtube.com/watch?v=vnzHU9VsliQ

but just use 92cwKCU8Z5c with the youtube code and you'll get the following