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Randall Munroe answers your wildest questions

The TED Interview

00:00

What if My Phone Was Based on Vacuum Tubes?

Vacuum tubes were used in the first computers of the 40s and 50s. A modern iPhone would take up a couple of city blocks, he says. It's just going to be much bigger, take much more power, and be much slower. The problem with vacuum tubes is that they produce a lot of heat.

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