The sting of the gympie-gympie, an Australian stinging tree, can cause pain for weeks or even months.
Why it is true
Its leaves and stems are covered with ultra-fine silica hairs that break off in the skin like needles and inject toxins. In 2020 scientists found that these toxins act on pain nerves in a similar way to spider and scorpion venom.
Source: Science Advances (Gilding et al., 2020)
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