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Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right).
The number at the top is how many half-lives have elapsed.
For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s.
Rutherford applied the principle of a radioactive element's half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206.
On the other hand, the time it will take a puddle to half-evaporate depends on how deep the puddle is.
Mathematically, the sum of two exponential functions is not a single exponential function.4 - In no event shall be liable to you or anyone else for any direct, special, incidental, indirect or consequential damages of any kind, or any damages whatsoever, including without limitation, loss of profit or the claims of third parties, whether or not advised of the possibility of such loss, however caused and on any theory of liability, arising out of or in connection with the possession or use of the data.5 - You agree to indemnify, defend and hold harmless Match.com, its affiliated entities, directors, officers and employees from and against any and all liabilities, losses, damages, claims or demands asserted against resulting from your misuse of the data.For example, the image on the right is a simulation of many identical atoms undergoing radioactive decay.Note that after one half-life there are not exactly one-half of the atoms remaining, only approximately, because of the random variation in the process.