> Today I had three students 1st y systeembeheer (== system maintainer?)
> do some calculations. One was an estimate of the time needed for a
> typical windows system cal. Their answer was 0.2 seconds, and that did
> not seem strange to them at all.

Ah, the sanity check.  Another completely missed concept.

At my previous job, my boss taught a course in endocrinology.  One test
had a question to the effect of "a healthy patient is observed to consume
1-L of fluid over a 2-hour period.  Calculate renal output."  Answers varied
from tens of mL up to multiple L.  Very few, if any, of the students thought
to consider that if one liter goes in, one liter had BETTER come out.

Mike H.
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