Engineer- OR, Mathematician test

An engineer, to vent his spleen,
got some socks in red and green,
he placed them in a simple box,
and proceeded then to withdraw socks.

The first sock he withdrew was red,
at which he frowned and scratched his head,
taking up his old slide rule,
he calculated long and cool,

Finally he made advances,
at working out withdrawal chances,
a green sock he then brought to light,
he calculated long, all night.

At last he dipped into the drawer,
and groped around for just one more,
but he could not prove his theory,
for it had got to dark to see,

Disillusioned, baffled, beat,
he placed two odd socks on his feet,
nobody noticed his odd way,
for socks at night, like cats, are grey.

An engineer or mathematician,
should stick to calculating fission,
for calcuilating socks is sad.
the results may turn out to be bad.

Should you wish to avoid his plight,
slide-ruling about all night,
then just ignore this colour cack,
make sure all your socks are black!

TL
MC