Word: sperm
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...repoduction of mammals, roughly half of a male's sperm contains X chromosomes which produce female offspring, and half contains Y chromosomes, producing males. Whether the offspring is male or female is determined by which kind of sperm unites with a female's egg. If scientists could separate the male-and female-producing spem, sex control would be easy...
...Fleet. War, which scattered the international whaling fleet, caught the U.S. short of sperm oil, badly needed for lubricating delicate submarine and aviation instruments. Most of the British and Norwegian whalers were converted into tankers and sunk or captured. But the Thorshammer and the Sir James Clark Ross managed to sneak past the Nazis, arrived in U.S. ports. They promptly went to work to keep the U.S. supplied with sperm...
...reasons which biologists do not clearly understand, male sperm is extremely sensitive to heat, is quickly destroyed even at body temperature. In many animals (notably man), sperm is protected by a special cooling system in the scrotum which keeps it at 2 to 15° below normal body temperature. Experimenters have caused temporary sterility in dogs, rabbits, cats and bulls by artificially heating their testes; Australian sheep breeders recently reported that a sterile breed of rams became fertile when a thick growth of wool on their testicles was sheared...
Tests were made on a group of healthy young men kept in a steam cabinet at 110° Fahrenheit for half an hour. After 18 days, their sperm counts fell well below the minimum for fertility, and they remained sterile for 67 days. Dr. Pincher, following up this study, investigated hospital and domestic bath temperatures which range from 105 to 110°. Putting two & two together, he suggested that the modern hot bath habit may be largely responsible for the declining birth rate in "civilized" countries...
...colonel now feels fine, commands his regiment, enjoys a normal sex life. (He is sterile; Dr. Frumkin will not try to connect the delicate sperm-carrying tubules...