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A coal miner completes a screening survey for coalworker's pneumoconiosis.. Screening, in medicine, is a strategy used to look for as-yet-unrecognised conditions or risk markers.
The Kratky method is a passive hydroponic technique for growing plants suspended above a reservoir of nutrient-rich water. [1] Because it is a non-circulating technique, no additional inputs of water or nutrients are needed after the original application, and no electricity, pumps, or water and oxygen circulation systems are required. [2]
The method was invented by John von Neumann, and was described by him at a conference in 1949. [1]In the 1949 talk, Von Neumann quipped that "Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin."