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Conjoined twins separation. Benjamin Solomon Carson Sr. (born September 18, 1951) is an American retired neurosurgeon, academic, author, and politician who served as the 17th United States Secretary of Housing and Urban Development from 2017 to 2021. A pioneer in the field of neurosurgery, he was a candidate for President of the United States ...
t. e. Plate tectonics (from Latin tectonicus, from Ancient Greek τεκτονικός (tektonikós) 'pertaining to building') [1] is the scientific theory that Earth 's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago. [2][3][4] The model builds on the concept of continental ...