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.
In 1642, Dutch explorer and navigator Abel Tasman (namesake of Tasmania) set out on a mission to explore the southern Pacific Ocean as an agent of the Dutch East India Company, and encountered the territories we now know as New Zealand, Tonga and Fiji.