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Scientific American

May 1, 1979

1 min read

The Amateur Scientist, May 1979

How to measure the size of the earth with only a foot rule or a stopwatch

By Jearl Walker

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This article was originally published with the title “The Amateur Scientist” in Scientific American Magazine Vol. 240 No. 5 (May 1979), p. 172
doi:10.1038/scientificamerican0579-172

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