How the components were heat-treated in the factory is another factor.

ECONOMIST: Aircraft fatigue

Sure, we understand that all milk must be heat-treated or pasteurized to kill off harmful micro-organisms (in 1987 the FDA mandated pasteurization of all milk products for human consumption).

FORBES: Why Milk Isn't As "Natural" As You Think

Those injured were a firefighter treated for heat exhaustion, a bystander who suffered a heart attack, and a couple in their 80s who were treated for panic attacks.

CNN: Firefighters make headway in California wildfire

It was the second title of the year for Mickelson, who had been treated for heat exhaustion and dehydration before carding a last day 69 for a 19-under total of 269.

CNN: Mickelson battles to second win of 2009

Washington, who believed in you -- (applause) -- who kept the heat on you, and have never treated teaching as a job, but rather as a calling.

WHITEHOUSE: President Obama Gives Commencement Address at Booker T. Washington High School | The White House