Son: "Dad! Dad! There is a monster under my bed!"
Dad: "Enjoy it while you can son, when you get married the monster sleeps in your bed."
John JolyBorn 1 Nov 1857; died 8 Dec 1933 at age 76. Irish geologist and physicist whose interests spanned several fields. Using Edmond Halley's method of measuring the degree of salinity of the oceans, and then by examining radioactive decay in rocks, he estimated Earth's age at 80-90 million years (1898). Later, he revised this figure to 100 million years. He published Radioactivity and Geology (1909) in which he demonstrated that the rate of radioactive decay has been more or less constant through time. He also developed a method for extracting radium (1914) and pioneered its use for cancer treatment, and invented a constant- volume gas thermometer, a photometer, and a differential steam calorimeter for measuring the specific heat capacity of gases at constant volume. |
