These tiles help space shuttles survive the extreme temperatures (about 1200 degrees Celsius) during re-entry to Earth. LI-900 silica tiles are used for this purpose. It is made of 99.9% pure silica glass fiber. Often the volume of air inside...
In the sky, the clouds darken and a fountain-like layer of clouds descends into the sea from among the black clouds. This causes the sea to shake and a vortex to form. In different parts of the ocean, seawater rises...
Qianshi limestone in Yangquan City, north China's coal-rich Shanxi Province / well-preserved petalodus teeth Studies in the samples have shown that the petal-shaped teeth have a crown that looks like a snout and has a long, tongue-shaped root. Shark petal-shaped...
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