Say this after the explanation of how lists are represented by numbers
when questions are asked for:
		But, Dr. Sevens, aren't numbers just abstractions of
		of voltages?  For example, a 1 is a high voltage, and 0
		is a low voltage.  Don't you think it's helpful to think
		about voltages, latches, gates, etc. when you program?
		I always do, because that's what's really happening---
		although it takes me a long time to write programs.