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For Tarski's problem about the elementary theory of free groups see free group. Tarski's circle-squaring problem; Tarski's plank problem; Tarski's exponential function problem; Tarski monster group; Tarski's high school algebra problem
A comparison of the structures of the natural estrogen hormone estradiol (left) and one of the nonyl-phenols (right), a xenoestrogen endocrine disruptor. Endocrine disruptors, sometimes also referred to as hormonally active agents, [1] endocrine disrupting chemicals, [2] or endocrine disrupting compounds [3] are chemicals that can interfere with endocrine (or hormonal) systems. [4]