4:48 pm ET -
US officials say 'significant sanctions' are having an impact on Russia as it tightens its grip on Crimea. But former Defense Secretary Robert Gates says Russia is unlikely to give up its hold.
1:45 pm ET -
Sand is used in the fracking process, and there's plenty of it to be mined in the upper Midwest. As a sand-mining boom has emerged, residents are divided over whether it's lifting or ruining their communities.
7:00 am ET -
The vigilante movement has been hailed in Mexican towns where the Knights Templar cartel wrecked havoc, but it raises questions about extralegal policing.
7:24 pm ET -
For the second year in a row, Sen. Rand Paul won the Conservative Political Action Conference's presidential straw poll. Sen. Ted Cruz did well too, showing the strength of anti-establishment Republicans within the GOP.
10:15 am ET -
With immigration reform stalled in Congress, young activists are stepping up protests to dramatize the toll of deportation on families. But critics question whether the actual numbers fit the claims.
11:46 am ET -
Malaysia Airlines plane, flight MH370, disappeared from radar suddenly on Saturday night. Two passengers listed on the Malaysia Airlines plane reported their passports stolen. Are the stolen passports indicative of a terrorist act?
9:38 am ET -
Ukraine is sparring with Russia over the identity of snipers who killed scores of people, police as well as protesters, last last month in Kiev. Solving the mystery could bolster or delegitimize Ukraine's leaders.
9:43 am ET -
As the world marks International Women’s Day, a glimpse at some innovative classroom lessons.
9:01 am ET -
The front-runner in tomorrow's election said the amnesty that protects guerrillas, right-wing officials, and soldiers from prosecution for civil-war-era crimes is no longer 'convenient' here.
9:17 am ET -
China's instinct is to stand by its strategic partner, but Russia's intervention in Ukraine's Crimea appears to violate China's principle of strict state sovereignty.
7:58 pm ET -
This week saw Brig. Gen. Jeffrey Sinclair on trial for sexual assault, and news of another case broke: A top Army prosecutor has been suspended after being accused of groping a military lawyer.