The international pictogramme for poisonous substances. The skull and crossbones has bitcoin wiki plants been a standard symbol for poison.
The difference between venom and other poisons is the delivery method. Industry, agriculture, and other sectors employ poisonous substances for reasons other than their toxicity. Two common cases of acute natural poisoning are theobromine poisoning of dogs and cats, and mushroom poisoning in humans. Apart from food, many poisons readily enter the body through the skin and lungs. Hydrofluoric acid is a notorious contact poison, in addition to its corrosive damage. 3 million cases of unintentional human poisonings occurred.
This resulted in 98,000 deaths worldwide, down from 120,000 deaths in 1990. Of increasing concern since the isolation of natural radium by Marie and Pierre Curie in 1898—and the subsequent advent of nuclear physics and nuclear technologies—are radiological poisons. Poisons widely dispersed into the environment are known as pollution. The scientific disciplines of ecology and environmental resource management study the environmental life cycle of toxic compounds and their complex, diffuse, and highly interrelated effects. Some poisons are also toxins, which is any poison produced by animals, vegetables or bacterium, such as the bacterial proteins that cause tetanus and botulism. A distinction between the two terms is not always observed, even among scientists.