The compound called salicin comes from the bark of the willow tree and it is the active ingredient of the pain reliever called 'aspirin'.
Cool trick
Cool trick New research has shown that a species of parasitic
wasp survives the winter by siphoning off antifreeze compounds from
the fly pupae which are their hosts. It is thought that these
findings could lead to more effective, year-round control of flies
by farmers using parasitic wasps. 8 JANUARY 2000, P. 9
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