There is a type of glass called aerogel that is 99.8% air, making it almost invisible and extremely light. A block the size of a coffee cup can weigh only a few grams. Despite its fragility, aerogel is an excellent insulator and can resist extreme heat, cold, and even sound. Scientists use it in spacecraft, windows, and super-insulated clothing.
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The Millau Viaduct in southern France is the tallest bridge in the world. Opened on 16 December 2004, its highest structural point reaches 343 meters (1,125 feet)—taller than the Eiffel Tower. Designed by engineer Michel Virlogeux and architect Norman Foster, the bridge carries traffic over the Tarn Valley while minimizing its impact on the landscape. It is widely regarded as one of the greatest achievements of modern bridge engineering.
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