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Oh! I've been there! We were visiting a friend in DC, and we went there to see an exhibit on building materials. They had a sample of that concrete that lets light through, it was featured in an IoTD once. But overall the exhibit seemed kind of low-quality--there was one writeup that referred to Thomas Jefferson as being like one of today's "early adapters" of technology, and we told some woman working there that they meant "early adopter," but she just nodded and looked like she couldn't care less. We were kind of confused why such a small and awkward exhibit would be in that giant, nice building. But we did enjoy our lunch in the little cafe.
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