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.
David was the first ever commercial radio announcer in Africa and became known as Mr LM Radio. He was a highly professional broadcaster and was responsible for training and developing many announcers who went on to become top radio men in South Africa and abroad. He died of cancer in the UK on 17 Jan 1974 aged 59. More about David Davies >>.