If you could measure it then that's the first sign that something is wrong.
In that case, I can tell you that you are very wrong. Khan's lessons have lots of soul. Not only soul, but also invisible dragons that breath the fire of knowledge!
I think Sagan's rant is cute, but ultimately wrong. And besides, when I talk about soul in this context, I'm obviously not talking about anything metaphysical. I'm just saying that his lessons are rather prosaic.
In that case, I can tell you that you are very wrong. Khan's lessons have lots of soul. Not only soul, but also invisible dragons that breath the fire of knowledge!
http://www.godlessgeeks.com/LINKS/Dragon.htm