Thieves apparently targeting people who exchange money at Mexico City's international airport shot a French citizen in the head on Tuesday, and authorities warned that gangs have put lookouts at exchange windows in the terminal.
Jan 29, 2009
Cement is one of the most consumed materials on the planet.
It's the foundation for our roads, our sidewalks and our cities.
It's also one of the biggest contributors to global warming.
But a new product could change that.