William Farr’s “law of elevation.” In London’s 1849 cholera outbreak, mortality fell sharply with height above the Thames: the widest bands at the bottom mark the highest deaths per 10,000 people, narrowing as elevation rises. Farr took this as evidence for miasma pooling in low ground, though the same gradient was also consistent with contaminated river water. Credit: General Register Office (William Farr), Report on the Mortality of Cholera in England, 1848–49 (London: HMSO, 1852).
"We need to have nature everywhere and we need to connect people with nature, we think we can do that.
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The guard is a predicate on the state space. If the guard is true in some state, the action is said to be "enabled" in that state. A program begins in any state satisfying the initial predicate. Then an enabled action is nondeterministically selected and executed atomically. This process repeats infinitely. If a selected action's guard is false, it is simply a skip and it does not change the state.
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