PBS NewsHour: Scientists search for understanding of dark matter (video)

PBS NewsHour science correspondent Miles O'Brien goes underground in pursuit of dark matter:

At the bottom of a nickel mine near Sudbury, Ontario, scientists at one of the world's most sophisticated particle physics observatories are investigating one of the biggest mysteries of the cosmos: What is dark matter? Science correspondent Miles O'Brien helps to shed some light on the research at SNOLAB.

Video, and here's a transcript.

Disclosure: I'm in a relationship with Miles, and I think he's awesome.