President Obama and first lady Michelle Obama attend a memorial service at Baylor University in Waco, Texas, on Thursday, for those killed in the April 17 explosion of a fertilizer plant.
Jewel Samad/AFP/Getty Images
April 25, 2013 Most of the 14 killed in the April 17 explosion were first responders trying to put out the fire and save lives.
Fertilizer runoff causes toxic algal blooms. This one covered a third of Lake Erie in 2011.
© Peter Essick/National Geographic
April 19, 2013 This week's explosion at the West Fertilizer Co. plant in Texas reminds us of the "cursed" side of the nitrogen that powers most of agriculture around the world. Through habit or necessity, we've come to depend on it. But there are costs.
An aerial photo of West, Texas, shows the remains of a nursing home (from left), apartment complex and fertilizer plant destroyed in an explosion at the plant Wednesday.
April 19, 2013 The Texas Department of Public Safety says the bodies of 14 people were recovered after the Wednesday night explosion, and 200 people are hurt. Rescuers are still searching houses for victims.
The remains of a fertilizer plant burn after an explosion at the plant in the town of West, Texas.
Mike Stone/Reuters /Landov
April 18, 2013 As the day dawned, officials said an estimated 5 to 15 people were killed and more than 160 were wounded. It was feared those numbers might go higher. The cause of the fire that led to the explosion at a plant near Waco is under investigation.
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