"A massive explosion at a fertilizer plant rocked the town of West, north of Waco, causing multiple casualties and leaving people trapped and buildings on fire.

Emergency personnel were bracing for the possibility of dozens of dead in the blast, which was reported at 7:53 p.m. and could be heard 45 miles away in Waxahachie.

Although authorities confirmed that at least five to 15 people had died, shortly before 5 a.m. they were still saying they did not have an official total. They have said they expect to find more bodies as they continue to search the area."

"Many Americans assume that the chemicals in their shampoos, detergents and other consumer products have been thoroughly tested and proved to be safe. This assumption is wrong."

"Synthetic chemicals added to consumer products to meet federal and state flammability standards are showing up in waterways, wildlife and even human breast milk."

While honey bee die-offs often called "colony collapse disorder" have been increasing for several years, so has scientific evidence that a widely used class of pesticides called neonicotinoids could well be an important contributing cause. In 2011, EPA said it would review its approval on one such pesticide. Now it says it expects to finish in five years.

"California on Thursday became the latest state to place restrictions on the chemical known as Bisphenol-A and declare it a reproductive toxicant."

"Analysis of commercially available rice imported into the US has revealed it contains levels of lead far higher than regulations suggest are safe."

"Both fruits are vulnerable to a nasty disease called fire blight that can devastate orchards. So organic labeling standards allow for antibiotics to be used on apple and pear trees. That exemption is set to end in 2014 -- but growers say they need a little more time."

"Toxic chemicals clinging to plastics could cause health problems for fish and other organisms in the Great Lakes."

"A 'rank' odor that has spread across parts of greater New Orleans may be linked to a leak from the 192,500-barrel-per-day Chalmette refinery, the U.S. Coast Guard investigating the smell said on Thursday."

"The increase is the result of the government last year lowering the threshold for lead poisoning."