you gotta hate 'em.
i read the micrometer screw gauge WRONGLY.
it's one of the basic-est things in physics i tell you!
i know i know how to read it.
careless, cuai, lalai..
i could've gotten 100%.
if only my 1/(2m) didn't suddenly transmogrify into (1/2)m
Nevertheless, I'm still satisfied with my results :)