We don't know too much about a Nepalese man who's in medical isolation in Texas while being treated for extensively drug-resistant tuberculosis, or XDR-TB, the most difficult-to-treat kind. Health authorities are keen to protect his privacy.

But we do know that he traveled through 13 countries — from South Asia to somewhere in the Persian Gulf to Latin America — before he entered the U.S. illegally from Mexico in late November. He traveled by plane, bus, boat, car and on foot.

Times were different in 1996 when he signed the Defense of Marriage Act into law, former President Bill Clinton writes in today's Washington Post.

A woman killed by a 550-pound male lion at a conservancy near Fresno, Calif., earlier this week may have been caught by surprise after the animal escaped its cage, investigators say.

According to a preliminary autopsy, Dianna Hanson, a 24-year-old intern for Cat Haven, was killed Wednesday when the lion snapped her neck.

"When I go outside and it's clear? Yeah, I look up. It's a habit. It's something I wish more people did. You may seem something that will profoundly affect you." — Phil Plait

Gazing up at the night sky is simultaneously humbling and utterly thrilling. This hour, we'll hear from TED speakers who share an infectious sense of wonder and curiosity about our place in the universe and what lies beyond our skies.

Part 4 of the TED Radio Hour episode Peering Into Space.

About Brian Greene's TED Talk

Is there more than one universe? Physicist Brian Greene shows how the unanswered questions of physics (starting with a big one: What caused the Big Bang?) have led to the theory that our own universe is just one of many in the "multiverse."

About Brian Greene

About Jill Tarter's TED Talk

The SETI Institute's Jill Tarter wants to accelerate our search for cosmic company. Using a growing array of radio telescopes, she and her team listen for patterns that may be a sign of intelligence elsewhere in the universe.

About Jill Tarter

Part 2 of the TED Radio Hour episode Peering Into Space.

About Phil Plait's TED Talk

What's six miles wide and can end civilization in an instant? An asteroid — and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.

About Phil Plait

Proving they can't be outdone by Rand Paul, NPR's Ken Rudin and Ron Elving filibuster their way through the latest podcast, assessing Jeb Bush's words on immigration, President Obama's strategy on sequestration, Donald Trump's attendance at the CPAC occasion and the results of the Los Angeles mayoral election.

North Korea responded to new U.N. sanctions aimed at starving its nuclear program by vowing to cut a Cold War-style hotline and scrap a nonaggression pact with the South.

State-run media said North Korea "abrogates all agreements on nonaggression reached between the North and the South ... and also notifies the South side that it will immediately cut off the North-South hotline."