Iodine, he went on was essential for the proper development ... was rather shocked to discover that when mixed with ammonia it produced a chocolate-coloured solid that exploded violently at the least ...

F. Z. Cramer, Naturwissenschaften, 38, 188 (1951). R. F. Cournoyer and S. Siggria, J. Polym. Sci., Polym. Chem. Ed., 19, 603 (1966). M. M. Zwick, J. Polym. Sci. A-1 ...

Iodine is an essential element - without which we would suffer severe developmental problems - and yet most of us have no idea how much we need, or where it comes from. In Their Element: Awesome ...