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All About Mount Rushmore

Located in the Black Hills of South Dakota, Mount Rushmore is among the oldest — and most recognizable — U.S. monuments.   How It Was Made Fast Facts  The memorial  

Watch a Raindrop Hitting Sand in Slo-Mo

Here’s something you don’t see every day, the slow-motion impact of raindrops on sand. The high-speed photography reveals the detailed liquid-drop impact dynamics  
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