Donald Knuth Doesn't Use Email

I have been a happy man ever since January 1, 1990, when I no longer had an email address. I'd used email since about 1975, and it seems to me that 15 years of email is plenty for one lifetime. Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration. I try to learn certain areas of computer science exhaustively; then I try to digest th...

 Ira Remsen Experiments with Nitric Acid

While reading in a textbook of chemistry, ... I came across the statement, 'nitric acid acts upon copper.' I was getting tired of reading such absurd stuff and I determined to see what this meant. Copper was more or less familiar to me, for copper cents were then in use. I had seen a bottle marked 'nitric acid' on a table in the doctor's office where I was then 'doing time.' I did not know its peculiarities, but I was getting on and likely to learn. The spirit of adventure was upon me. Having...

 The Wonder of Curing Polio

The most compelling cases of preferring fact to fiction are the most practical. All the prayer, animal sacrifice, and chanting in the world couldn’t cure polio—the Salk vaccine did. And how did we find it? Through rigorous, skeptical, critical thinking and testing and doubting of every proposed solution to the problem of polio until only one solution was left standing. Let others find uncritical acceptance of pretty notions a wonderful thing. I’m more awestruck by the idea of ending pol...

 Overcoming Fear

Overcoming fear requires you to train yourself to think every time you feel fear, rather than just reacting instinctively. The thought process I go through goes like this: I'm scared. Is it physical danger? No. Well, when I make a decision based on fear, it's often a bad one, so I'm going to put the fear aside and ask myself "What is my purpose in this situation?" I'll make my decision consciously based on what helps achieve my purpose better, rather than unconsciously on my instinctive des...

 Skeletal Similarities in Mammals

What a piece of work is the mammalian skeleton. I don't mean it is beautiful in itself, although I think it is. I mean the fact that we can talk about 'the' mammalian skeleton at all: the fact that such a complicatedly interlocking thing is so gloriously different across the mammals, in all its parts, while simultaneously being so obviously the same thing throughout the mammals. Our own skeleton is familiar enough to need no picture, but look at this skeleton of a bat. Isn't it fascinating ho...