A pair of asteroids are about to whiz past Earth, but we'll be fine

One of the great things about having powerful observational tools to scan the heavens is that we have a good chance of spotting potential planet-killing asteroids before they actually get here. The other side of that coin is that scientists keeping an eye on possible threats have to sift through lots and lots of space rocks that will never pose a problem for our planet. That's the case for a pair of asteroids set to pass by Earth in the next couple of days. The rocks, called 2010 C01 and 2000 QW...