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"MEXICO CITY -- An explosion rocked the headquarters of Mexico's state-run oil monopoly Pemex, killing 25 people, injuring 101, and damaging three floors of Mexico's second tallest building before sending plumes of smoke into the Mexico City skyline."

"Vitamin D plays a pivotal role in a number of disorders. Now scientists are investigating whether the 'sunshine vitamin' could be implicated in autism. With autism rates climbing and levels of vitamin D declining because of more sunscreen use and less time spent outdoors, scientists have begun to look into a possible link."

"Chevron ignored potentially life-threatening dangers to workers at its Richmond refinery and should pay a record fine of nearly $1 million stemming from the fire there in August, state regulators said Wednesday."

"Did you have a nasty case of food poisoning this year? Chances are that fruit or vegetables were the culprit."

"Changes in the climate are happening much faster than animals are able to respond."

"We’ve come a long way since the days when kids played in clouds of DDT, gas stations sold leaded gasoline, and smoking near youngsters was commonplace."

"It's a lake, yes. But it's also a bomb. Those pale blue blobs, stacked like floating pancakes down at the bottom of this photograph? They're astonishingly beautiful, yes, but they can be dangerous."

"Butterflies from the southern US that used to be rare in the northeast are now appearing there on a regular basis. The trend correlates to a warming climate report the authors of a paper in Nature Climate Change."