From the U.S. Department of Energy:
Happy #FourthofJuly! Ever wonder how the fireworks you see lighting up the night skies work? Check out these 5 illuminating facts ➤ http://1.usa.gov/1IwarD0
Tags: #july4 #july4th #julyfourth #fourthofjuly #4thofjuly #independenceday #independenceday2015
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