Watch 4:56
News Wrap: 9 Americans killed in brutal Mexican ambush
In our news wrap Tuesday, nine Americans, including six children, were brutally killed in an ambush in northern Mexico, about 75 miles south of the U.S. border. Mexican officials are investigating whether the attack was a case of mistaken identity.
Colorado asks EPA to lower state’s air rating
It's time to stop "sugar-coating" Colorado's air problems, Democratic Gov. Jared Polis said last month. "Moving to 'serious' status finally helps us stop sweeping our air quality crisis under the rug and gives us additional tools to move urgently to…
The hotter the planet grows, the less children are learning
Every 1-degree-Fahrenheit increase in average temperature reduces student learning by 1 percent, a study finds.
Watch 6:45
How a classroom on wheels is expanding access to early education
Although preschool can provide children with a vital foundation for success later in life, only 43 percent of four-year-olds nationwide have access to public preschool. The rate varies widely, with no options available in some rural and low-income areas, sometimes…
Some states that have legalized marijuana for recreational use have experienced a surge in the drug’s black market activity. In particular, Colorado has become a haven for underground marijuana cultivation, sale and export, prompting questions about how legalization led to…
School officials said the number of people trying to get close to or even inside the school reached record levels this year, which marked the 20th anniversary of the shooting.
Authorities did not release the name of the student who died, but said it was an 18-year-old man.
The key sticking point of variable performance pay system for those working in tougher environments will be studied to determine if they help retain teachers in schools, the teachers' union said.
The meeting, facilitated by a federal mediator, was the first time the sides met since talks broke down over the weekend.
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