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In a Friday, May 9, 2014 photo, Robert Jefferson, 86, stands on his Heritage Farm in Dunkerton, Iowa. Jefferson's Heritage Farm is 158 years old, and one of only 10 in Black Hawk County that have earned the Heritage designation from the Iowa Department of Agriculture and Land Stewardship. (AP Photo/Waterloo Courier, Matthew Putney)

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In a Friday, May 9, 2014 photo, Robert Jefferson shows how an old hay fork would work on his Heritage Farm, in Dunkerton, Iowa. Jefferson's Heritage Farm is 158 years old, and one of only 10 in Black Hawk County that have earned the Heritage designation from the Iowa Department of Agriculture and Land Stewardship. (AP Photo/Waterloo Courier, Matthew Putney)

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Stephen A. Smith (Image: ESPN screenshot)

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A massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)

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A massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)

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A massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)

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Firefighters, police and media crews evacuate the immediate area of the fire for a 1/2 mile zone amid fears that tanks of flammable materials including propane tanks, might explode. The massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)

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Firefighters, police and media crews evacuate the immediate area of the fire for a 1/2 mile zone amid fears that tanks of flammable materials including propane tanks, might explode. The massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)

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A massive fire at a chemical plant outside Atlanta on Friday night May 23, 2014 prompted the evacuation of hundreds of people from nearby businesses and spewed black plumes of smoke that were visible from miles away. The fire started shortly after 8 p.m. in a warehouse containing chemicals in Marietta, Georgia. The warehouse houses Amrep, which manufactures a variety of chemical products, including automotive supplies, according to the company's website. (AP Photo/Atlanta Journal-Constitution, Kent D. Johnson)