Word: layer
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...they were moved to the sail to keep them as far as possible from the sonar in the bow. Another trouble is control. The Skipjack's maximum depth has not been announced, but even if it is better than 1,000 ft., the ship has a comparatively thin layer of water in which to maneuver. Cruising at 40 knots (67½ ft. per second) close to her depth limit, a slight error in the up-and-down steering will carry her down to hull-crushing depths in seconds...
...demand for the more prolific egg layer has required more and more automation. Near Atlanta, Ga., Layer Breeder Roy Durr produced 500,000 chickens last year trying to keep up with orders for layers. He puts the eggs in special incubators that vastly improve on the maternal solicitude of real hens. A hen often forgets to turn her eggs (causing the membrane lining to adhere to the shell and killing the fetus), or in hot dry weather leaves the nest and lets them dry out. Durr's mechanical mother turns each egg every hour, and when a thermometer warns...
Some unknown force must support the bulges, which could not exist if the earth were a simple, spinning mass of plastic material. One possibility: the earth's mantle (the 1,800-mile layer below the crust) may not be as plastic as has been thought. It may have mechanical strength, like brickwork, that keeps the earth out of shape. Another possibility: the bulges are supported by slow currents in the mantle, which push up the surface like massive bubbles in a spring...
...breaking out of a crevice. Physicist J. H. Fremlin of the University of Birmingham, England theorized in this week's Nature that if the bottoms of lunar craters are deeply covered with dust, as many astronomers think, they are likely places for gas eruptions. The dust layer, says Fremlin, would be a good heat insulator. It would trap under the crater's floor the heat generated by radioactivity in the moon's rock. Many times in a million years the rock might get hot enough to spew out some...
...worked at the distance (4,660 miles) at which the Lunik swept past the moon, but they would be grateful for any information that the Russians choose to release. Dr. Kuiper believes that the moon's surface is blazing with radioactivity. On the earth, he says, the thick layer of air is the shielding equivalent of 3 ft. of lead or 33 ft. of water, protects the surface from many kinds of tough radiation beating down from space. Kuiper believes that the moon is radioactively contaminated to a depth of 30 ft. below the surface...