Science: Micromicrocamera

One of the questions medieval debaters liked to argue was how many angels could dance on the head of a pin. The National Bureau of Standards does not allow itself to measure angels—but it has developed a micromicrocamera that can put a page of the Bible on a bit of photographic film much smaller than a pinhead. On this scale all the pages of a Bible would barely cover Lincoln's head on a if piece; the 27,357 pages of the Encyclopaedia Britannica could be reproduced on the back of a matchbook.

The camera that...

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