Monarch butterflies have magnitite (a mineral) inside their heads and this helps them determine 'North', just like a magnet.
Loitering insecticide
Loitering insecticide A pesticide which was banned in 1988 is still
hanging around, say scientists. ‘Chlordane’ is still
found in many garden vegetables, especially root vegetables such as
carrots, beets and potatoes. Scientists from the Connecticut
Agricultural Experiment Station studied a piece of ground which was
last treated with chlordane in 1960. Vegetables which were grown
there still contained traces of the dangerous pesticide, which can
lead to disorders of the digestive and nervous systems. 15 JUNE 2000
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