Ying Yin

A mighty old fella who looks like a mountain but is really a hill. He’s tall, smart, a math genius, condescending, a MATH GENIUS, and really likes trying your glasses to see which one he liked best.

Friend #1: If x=y, does that mean y=c?!
Friend #2: Sigh… YING YIN. COME BACK. WE NEED YOU