When dark matter collides, things get weird

Dark matter just got a shade more mysterious. Scientists studying a smashup between giant clusters of galaxies have watched how each cluster's dark matter passes through the collision -- and found that it seems to contradict certain theories of ...

Facebook outlines plans for virtual reality

SAN FRANCISCO -- Facebook and virtual reality, at first glance, might seem like pieces of a puzzle that don't exactly fit in the social network's future.

But as Facebook wrapped up its annual F8 conference on Thursday, the company's chief ...