Dinosaurs dominated life on Earth for millions of years and then disappeared very suddenly. To solve the mystery, paleontologists studi...
An Undesirable Precipitation Reaction
Boiler scale almost fills this hot-water pipe. The deposits consist mostly of CaCO 3 with some MgCO 3 . Limestone (CaCO3) and dol...
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Distribution of Elements on Earth and in Living Systems
The majority of elements are naturally occurring. How are these elements distributed on Earth, and which are essential to living system...
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The Importance of Units
Artist’s conception of the Martian Climate Orbiter In December 1998, NASA launched the 125-million dollar Mars Climate Orbiter, int...
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Primordial Helium and the Big Bang Theory
A color photo of some distant galaxy, including the position of a quasar. Where did we come from? How did the universe begin? Humans...
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what are the Steel manufacturing process ?
Techniques for assembling steel have advanced essentially since mechanical generation started in the late nineteenth century. Present da...
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