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Slow-Motion Video Of A Bridge Exploding Is The Best Way To Start The Week

• http://www.popsci.com, By Martha Harbison
 Monday mornings pretty much always make me feel like blowing things up. So watching videos about things blowing up -- or people blowing things up -- seems to be a perfect way to ease into the work week.
 
Happily for my now-improving mood, demolition experts demolished a 1930s-era steel bridge along US 281 in Marble Falls, Texas over the weekend, and someone was there to film it. I love how the first two passes of the video -- real-time and semi-slo-mo -- it's difficult to see exactly how the demo goes. But the third time, look closely under the bridge. You can totally see the detonator cords burning up ahead of the ignition of the shaped charges that brought the trusses down.  The video also clearly demonstrates the difference between the speed of light in air and the speed of sound in air -- the flashes from the charges are long gone by the time the sound waves make it to the filming location.
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