Modeling Molecules

they creep out from behind their covalently bonded brethren,
skinny and breathless, and skip up towards vacuum, pausing for a
moment only to make a quick move so as to escape detection.
a ping and they're gone into the depths of space and I missed them,
looking behind a large mirrored surface to see if they were still there.
they only partially follow their equations, and only when they want;
if it's raining in Houston and an anomymous man in Mission Control
reaches into his desk drawer for a certain fountain pen, they seem to take
that as license to slither on out and disappear,
oh molecules, so difficult to model.