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The convention dependence of one-way light speed is explained in a manneraccessible to those unaccustomed to the concept. That logic is used tochallenge the claim by Greaves et al that their experiment detected one-waylight speed. The reason for the result obtained is then presented and followedby an explanation of why the Romer experiment did not measure a conventionindependent one-way light speed.

Can One-Way Light Speed be Measured? Comment on E. D. Greaves et al., Am. J. Phys. 77(10), 894-896 (2009)