Happy Birthday/PhD Nathaniel: "That's Mathematics"

As well as turning 28, last month my brother graduated from UCSD with is PhD(!) in mathematics. So, as a combined gift, I got the family and Chelsea together to record a math themed song for him. We recorded "That's Mathematics" by Tom Lehrer.

Happy birthday and congratulation Nathaniel. You are the best source of pride and inspiration a little brother cold ask for.

Tom Lehrer's "That's Mathematics" for Nathaniel: