4 ms·
It was invented at [Caltech](http://www.feynmanlectures.caltech.edu/ http://www.feynmanlectures.caltech.edu/).
by beojan 8y ago
It was invented at [Caltech](http://www.feynmanlectures.caltech.edu/ http://www.feynmanlectures.caltech.edu/).
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