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.
He undertook his first expedition to Africa in 1904 to the Kasai district in Congo, formulating the African Atlantis theory during his travels. During World War I in 1916/1917, Leo Frobenius spent almost an entire year in Romania, travelling with the German army for scientific purposes.