Letters From Our Readers, April 19, 2021

NASA calibration target image
Credit: NASA/JPL/Caltech
Detective Work Reading the excellent coverage of the Perseverance landing on Mars (March 8-21, p. 34) , I noticed that one of the calibration targets was marked “221BBAKER.” There must be a Sir Arthur Conan Doyle fan at the Jet Propulsion Laboratory: That was Sherlock Holmes’ address in London...

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