HARRY LEWIS: I'm Harry Lewis. I'm a professor of computer science here at Harvard. I came to Harvard in 1964, as a freshman. And except for three years off during the Vietnam War, I've been here ever since. 

I'm now head of the undergraduate program in computer science. And I've taught lots of different courses over the years. And I'd like to tell you a little bit about some of the interesting things that have gone on at Harvard, of which I have had some contact over the years. 

Here's my undergraduate thesis in 1968, which I wrote a two-dimensional programming language. This is a core memory plane. Those are little magnetic donuts that are strung on the intersections of wires. And this was the way memory was done before semiconductors became a viable technology. 

This is a early 15 gigabyte iPod, which I keep around not because anyone's impressed with having a 15 gigabyte iPod, but because this is a 70 megabyte drive. And they went in disk drives that were about the size of washing machines. So that was only 70 megabytes of memory. That gives you some sense of how things have scaled.