Genius 130

[hankir]

Need one last word.

I'm into tungsten, copper and dark matter, possibly. (4)

WI?P

copper = policeman = MP
But can't find meaning of wimp that means dark matter.
The other word that fits is WISP.

Thanks in advance.

[elliemay1]

WIMP - dark matter
The WIMP (Weakly interactive massive particles) form a class of heavy particles, interacting slightly with matter, and constitute excellent candidates with the nonbaryonic dark matter.

[hankir]

Thanks, elliemay1.

OK, nonbaryonic dark matter it is.

[elliemay1]

You're welcome, hankir, and thanks.