How about a MOLECULAR sieve?
The Big Bang Theory Season 2, Episode 18
...and look for the seminar
on MOLECULAR positronium, then...
The Big Bang Theory Season 1, Episode 10
...for that dense MOLECULAR cloud
of Aramis to dissipate.
The Big Bang Theory Season 1, Episode 3
...on MOLECULAR positronium.
The Big Bang Theory Season 1, Episode 10
...because we were attending a symposium
on MOLECULAR positronium?
The Big Bang Theory Season 1, Episode 10