It's Not the Heat

In a neat little experiment reported in the Proceedings of the Society for Experimental Biology and Medicine, some Jerusalem scientists discovered that when rats are moved from a hot, dry atmosphere to a hot, humid one, their thyroid glands speed up.

Among other things, a speeding thyroid increases nervous tension. The Jerusalem rats may therefore help to explain why New Yorkers are fratchy in July and why a man who commits murder in Naples when the sirocco is blowing can hope for lenient treatment in court.

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