Dark Matter Search Takes a Surprising Turn | NOVA | PBS

Decades of searching for dark matter particles have come up empty, so physicist Elba Alonso-Monsalve lays out why some researchers are now betting on primordial black holes instead. It is a candidate strange enough that even she treats it as a long shot worth testing.

Why it's free: Free on NOVA PBS's own channel; GBH produces NOVA for PBS.