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Friday Pub Quiz

Forums New posts
THE internal compasses of some animals might work by detecting minute changes in the pace of biochemical reactions in different magnetic fields, researchers in the US suggested this week. They say their theoretical studies could contribute to the debate on whether the electromagnetic fields of powerlines cause diseases such as cancer.

Many creatures, including some birds, amphibians and reptiles, navigate by sensing tiny changes in the Earth's magnetic field. Sea turtles, for instance, can sense changes as small as a tenth of a microtesla—less than 0.2 per cent of the typical geomagnetic field.

But nobody knows exactly how these biological compasses work. One theory is that the magnetite molecules found in some tissues act just like miniature compass needles. Another is that animals sense changes in biochemical reaction rates caused by differing magnetic fields, which are known to alter the pace of a wide range of chemical reactions.
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So please let me know how you can get one answer when the New Scientist says this.
 
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