Medicine: Ragweed Fallacy

The promiscuous sexual life of the giant ragweed (Ambrosia trifide)and other species again last week brought tears to the eyes of several million U.S. hay fever sufferers. In the next few weeks a good million tons of ragweed pollen will drift imperceptibly over the U.S. seeking mates.

Meanwhile an army of 4,000 men has for several weeks been uprooting ragweed in New York City, where it is now a legal offense to let the weed grow. Similar campaigns are under way in other towns.

Chicago could have told New York that it is wasting its...

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