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>> HARRY LEWIS: I'm Harry Lewis.

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I'm a professor of computer
science here at Harvard.

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I came to Harvard in
1964, as a freshman.

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And except for three years
off during the Vietnam War,

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I've been here ever since.

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>> I'm now head of the undergraduate
program in computer science.

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And I've taught lots of
different courses over the years.

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And I'd like to tell you
a little bit about some

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of the interesting things that
have gone on at Harvard, of which I

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have had some contact over the years.

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>> Here's my undergraduate
thesis in 1968, which

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I wrote a two-dimensional
programming language.

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This is a core memory plane.

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Those are little
magnetic donuts that are

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strung on the intersections of wires.

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And this was the way memory
was done before semiconductors

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became a viable technology.

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>> This is a early 15 gigabyte
iPod, which I keep around

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not because anyone's impressed
with having a 15 gigabyte iPod,

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but because this is a 70 megabyte drive.

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And they went in disk drives that were
about the size of washing machines.

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So that was only 70 megabytes of memory.

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That gives you some sense
of how things have scaled.