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The beach they go to has real sand, lots of it, with blankets and beach umbrellas, salt water, a refreshment stand, seagulls, dead crabs, sandbars, waves.
NEWYORKER: Getting Closer
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The Water Taxi Beach, a bar with real sand and volleyball courts, serves up drinks and snacks, as well as spectacular views over to Ellis Island and Manhattan.
BBC: An urban oasis off the coast of New York City
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It can be made a model of DNA, or a model of a whole city like this one is, and sometimes they can make the model exist in the silicon of a computer, so you've got a computer model, and other times, they actually use real silicon and sand, which they're doing it, in this case, like a giant hands-on model.
NPR: Scale Model Aids Probe of Katrina Damage