"Hearts as both and cars"

My iTunes started playing the Disney song "I'm Professor Ludwig von Drake", and there was a line I couldn't hear clearly.  I googled it, and got:

I know all about atomic energy
hearts as both and cars and bio chemistry

"Hearts as both and cars"?  That doesn't make any sense.  The first dozen or so google results seemed unanimous, but there's no possible way that's the lyric.

Upon further selective googling, I found, and decided I agree with, this TVTropes page:  "horses, boats and cars."

I know all about atomic energy
Horses, boats and cars and biochemistry
but when it comes to brain surgery then I can only do swell.

 And now I'm blogging it in the hopes of increasing the googleability of the correct lyrics.