Re: blood sugar and sleep and things

[http://dummy.us.eu.org/robert (Robert)]

 > From: Brian <http://www.cs..edu/~b>
 > Date: Tue, 3 Nov 2020 00:17:06 -0800
 >
 > this kid pumpkinhead who had 
 > posted a question about how to reverse an infinite stream, and when I 
 > explained about that I suggested that instead he try to make the stream 
 > of all positive rational numbers, telling him it's a hard problem that 
 > was solved around 1900 (a bit earlier, it turns out) by Georg Cantor, 
 > and he said "Wait, they had streams in 1900?" which is a good question, 
 > so I said "no, but they had numbers," and so then I had to teach him set 
 > theory, so he would understand the relationship between denumerable sets 
 > and streams, and between one thing and another I didn't have breakfast 
 > until a little after 5pm.

Doing this without a chalkboard or whiteboard must've been painful.