Word: mollusk
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Dates: during 1950-1959
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...Exact heading: northwest by J4 north, i.e., 318° true. *The first Nautilus, built by Robert Fulton in 1800, was named after the paper nautilus, a mollusk that was mistakenly thought to cruise the surface of the sea with fleshy sails, and to submerge at will. Most famed Nautilus (named after Fulton's) was the prodigious sea raider commanded by Captain Nemo in Jules Verne's Twenty Thousand Leagues Under the Sea. † Natural uranium from which some of the nonfissionable U-238 has been removed, leaving a larger proportion of fissionable 0-235. *The story of Rickover...
...After the pearly, spiral-shelled mollusk, the "chambered nautilus" of which Oliver Wendell Holmes wrote...
...Prize, 1934) proved three years ago that certain fossil sea shells can be used as fossil thermometers to measure "paleotemperatures." His method takes advantage of the fact that normal oxygen contains two stable isotopes, oxygen 18 and oxygen 16, in the proportion of 1 to 500. When a sea mollusk takes up calcium carbonate (CaCO3) to build its shell, the proportions of the oxygen isotopes in it vary with the temperature of the sea water. The warmer the water the less oxygen 18 is built into the shell...