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Hace 5 horas · AT&T was founded as Bell Telephone Company by Alexander Graham Bell, Thomas Watson and Gardiner Greene Hubbard after Bell's patenting of the telephone in 1875. By 1881, Bell Telephone Company had become the American Bell Telephone Company. One of its subsidiaries was the American Telephone and Telegraph Company (AT&T), established in 1885. On December 30, 1899, AT&T acquired the assets of its ...
Hace 5 horas · Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features. [1] [12] There are three types of Down syndrome, the ...
