The southern African nation of Botswana is grappling with a relatively new problem in the evolving AIDS pandemic: It now has a large group of HIV-positive adolescents.

The teenagers were infected at birth before Botswana managed to almost wipe out mother-to-child transmission of the virus. These children have survived because of a public health system that provides nearly universal access to powerful anti-AIDS drugs.

NASA has released a new, stunning panoramic image of Mars. The scene is stitched from 817 images taken by NASA's Mars Exploration Rover Opportunity from Dec. 2011 to May.

To do the image justice, you have to download the hi-resolution version, but be warned it's close to 14 MB.

Here's how NASA describes the scene:

Any doubt, and there probably wasn't much, that Texas would reject an expansion of Medicaid under the big federal health law was dispelled today.

The Supreme Court decision on the Patient Protection and Affordable Care Act allows states to opt out of the expansion without losing all federal Medicaid funding. Only the federal money that would have gone toward the expansion is affected.

When we think about improving urban food systems, we tend think about growing more vegetables — densely planted backyard plots and community gardens, with tiny tomatoes ripening in the sun. But according to some experts, we should start thinking smaller — way smaller — as in bugs.

Update at 5:58 p.m. ET. Lawsuit Dismissed:

A federal judge dismissed a lawsuit filed by Lance Armstrong that sought to stop a USADA hearing into accusations of doping. The AP reports:

"U.S. District Judge Sam Sparks ruled just hours later. He criticized Armstrong's attorneys for filing an 80-page complaint the judge says seems more intended to whip up public opinion for his case than focus on the legal argument.

"Sparks, however, did not decide on the merits of Armstrong's case and said he can refile his lawsuit."

Over the weekend, about 1.7 million Libyans cast a ballot to choose a prime minister. Like Tunisia and Egypt before it, these elections are the first free elections since a revolution toppled the country's dictator.

Moammar Gadhafi ruled since 1969. As Reuters reports, while there were some violent incidents and anti-vote protests, international observers gave the election process a thumbs up.

Reuters reports:

An investigation into a perplexing outbreak among young kids in Cambodia is getting traction.

Doctors have identified a potential cause, a virus associated with hand, foot and mouth disease. (The illness is not foot-and-mouth disease, which affects only animals.)

Brian Castner arguably had one of the most nerve-wracking jobs in the U.S. military. He commanded two Explosive Ordnance Disposal units in Iraq, where his team disabled roadside IEDs, investigated the aftermath of roadside car bombings and searched door to door to uncover bomb-makers at their homes.