Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.
FLYING Magazine on MSN
Does Lost Student Pilot Logbook Mean Lost Hours?
Answer: I think something got lost in translation there. It is my understanding that once the hours are logged in your ...
Here is a close look at the common- versus differential-mode voltage and instrumentation amplifier (IA) topologies.
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