Mexico

Mexico's gas crisis, explained

At least 89 people died on Friday when a cracked fuel pipeline ignited and exploded. The explosion comes as Mexico has shut down six pipelines to fight fuel theft, which has caused shortages that some say added to Friday's death toll.

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Environment

Saving the sharks

Sharks may be fearsome predators, but over fishing threatens their survival. The World's Julia Kumari Drapkin profiles an unusual pair of shark researchers. One has always wanted to protect sharks. The other used to kill them.

Mexico's crime problem

At least 1,000 people have been killed in Ciudad Juarez, just south of El Paso, in drug gang battles just this year. Houston Chronicle reporter Dudley Althaus has been reporting on the violence and tells Lisa Mullins that this year's crime level is unprecedented.