A Louisiana Denka plant, located next to an elementary school, has been emitting toxic chemicals for years. NBC News’ Cynthia McFadden first reported on this issue last month and returns now after Michael Regan, the head of the EPA, proposed a staggering slate of emissions standards for 80 toxic chemicals. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC …

The PERiLS Project is a unit that specifically studies tornadoes in the Southeast, which researchers say are growing more frequent and deadly. NBC News’ Blayne Alexander shares more about how “Tornado Alley” is evolving. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver …

The universe was very different in its first few hundred million years. Gravity was just kicking in to clump together clouds of gas and … source