The first mathematical theory of tides was introduced by Galileo.
Edward Forbes believed that the abundance and variety of marine life decreased with increasing depth and, by extrapolation of his own measurements, Forbes calculated that marine life would cease to exist below 300 fathoms (1,800 ft; 550 m).
Sir William Thomson (Lord Kelvin) created the first tide-prediction machine.
The economic policies of Mikhail Gorbachev of the Soviet Union and of Deng Xiaoping of China included "<span>(4) a reliance on agricultural self-sufficiency"</span>
