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.
Dutch explorer Abel Tasman, in 1642, was the first non-Polynesian to sight the North West coast of the South Island of New Zealand.(There is a claim, disputed by most historians, that a Portuguese expedition led by Cristovao de MendonÃ§a beat him to it over a hundred years before in 1521-1524).