This video goes a long way to answer two very important questions: 1. How does gravity work? and 2. How did Albert Einstein become a celebrity? While the second question is more interesting in the moment, this video gives a really simple explanation of the difference between Newton's definition of gravity and Einstein's. And then it take us on an adventure to the Southern Hemisphere (and the cosmos) for proof. -via Digg
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More importantly, though, where's the pancake effect? This thing just flopped down onto the freeway below - which remained standing so that the fire dept. could walk along it with hoses etc. But the drop was much more than that between floors of WTC, and the mass of the collapsed span enormously greater than a falling bit of floor.
So I honestly don't think this validates any official explanation for Trade Center collapses