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Is the galaxy full of Earths?
Jim Bell says NASA's latest discovery support the notion that habitable worlds are probably common in the galaxy.
Ukraine crisis could pull U.S. to war
Graham Allison says if an unchecked and emboldened Russia foments conflict in a nation like Latvia, a NATO member with a Russian speaking population, the West would have to defend it.
See why Navy paid $3 billion for this
The US Navy's newest stealth destroyer is twice as long as the Statue of Liberty but barely shows up on radar.
The best show you're not watching
If fans thought season one of "Orphan Black" was mysterious, get ready to spiral deeper down the rabbit hole for a second season. The show returns this Saturday April 19 on BBC America.
Taylor Swift surprises bride at shower