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Josefina Vazquez Mota is the first woman from a major political party to run for president. She has pledged to crack down on corruption but is having trouble distancing herself from President Felipe Calderon. He's from the same party, and his drug war has failed to halt cartel violence.

Doctors estimate there are about 250 severe scorpion stings a year in America, but the U.S. ran out of its own supply of scorpion antivenom nearly a decade ago. Mexican doctors, however, have been treating stings from venomous creatures for years, and what they've learned may now save American lives.

Drug violence has forced thousands of Mexican families to seek refuge in the U.S. As a result, some students are entering U.S. classrooms along the southwest border with traumas that schools have never seen before.

Mexico's war with drug cartels has left more than 30,000 people dead over the past four years; in 2010 in Juarez alone, more than 3,000 died. Many of those killed are involved in criminal gangs. But many caught in the crossfire are innocent bystanders or victims of mistaken identity.

Mexico's war with drug cartels has killed more than 30,000 people in the past four years. Many were gang members or somehow tied to the cartels; others were random bystanders. They include two teenagers who lived on opposite sides of the U.S.-Mexico border in very different worlds.

Mexican and U.S. leaders have vowed to track down the gunmen who killed three people, including two U.S. citizens, with ties to the U.S. Consulate in the border town of Juarez. Mexican authorities say they believe the killings are linked to the country's raging drug war.