The primary function of the thyroid is the production of the iodine-containing thyroid hormones, triiodothyronine (T3) and thyroxine (T4) and the peptide hormone calcitonin. 1  T3 is so named because it contains three atoms of iodine per molecule and T4 contains four atoms of iodine per molecule.
David Livingstone was born on March 19, 1813, in Blantyre, South Lanarkshire, Scotland, and grew up with several siblings in a single tenement room.
On July 25, 1415, a Portuguese fleet with King Joao I and his sons Prince Duarte, Prince Henry âThe Navigatorâ, and Prince Afonso, along with Supreme Constable Nuno Alvares Pereira, set out to conquer North Africa starting with the coastal towns of Ceuta and Tangier.