Word: cannot
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Dates: during 1940-1949
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...Malthusians, who assert that the world population is outrunning its food supply, the commission report makes this answer: "The danger that a shortage of foodstuffs entering the world markets may continue indefinitely to the serious detriment of countries whose populations have outstripped their own agricultural resources cannot, we think, be rated higher than a possibility...
Bernard Shaw this week warned foreigners visiting Britain to speak broken English: "Even among English people, to speak too well is a pedantic affectation. In a foreigner it is something worse than an affectation. It is an insult to the native who cannot understand his own language when it is too well spoken...
Differential Effect. Surgery cannot help the other 9,000,000. Many cancers involve vital organs that cannot be disturbed, or metastases which spread so quickly and widely throughout the body that the surgeon cannot find and remove them all. To deal with such cancers some agent is needed that has a strong "differential effect," i.e., that kills cancer cells without hurting normal tissue. A few such drugs are already known, but they are only a start, and not good enough...
...most rudimentary understanding of the workings of the living, changing cell is enormously difficult. It would be even harder without a new tool: nitrogen 15, a stable (nonradioactive) isotope of nitrogen. Chemically, nitrogen 15 is exactly like the common nitrogen 14. The cells cannot tell the difference. But since it is slightly heavier, nitrogen 15 can be measured accurately by a balky and expensive instrument called a mass spectrometer. If compounds containing nitrogen 15 instead of ordinary nitrogen are fed to cells, the scientists can tell with the mass spectrometer whether the cells have accepted them as food...
Some types of thyroid cancer do not respond to this treatment. The cells cannot be trained to take up iodine and kill themselves. But many patients have been helped to some extent. In four of them the disease has been definitely checked, though not wiped out entirely...