Heroism is a salamander virtue. Sometimes fear wakes immortal courage in a craven; avarice will make a miser brave; an infantryman who got the Congressional Medal for taking a machine-gun nest single-handed declared that he sallied out because he was afraid of lightning—a thunderstorm had made him too nervous to stay in his trench. But the 75 U. S. soldiers who, in the Philippines, voluntarily submitted to the bite of the yellow fever mosquito to find out whether this insect also carried dengue fever, had no such excuse. Their story was told...
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