Word: subs
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Dates: during 1980-1989
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...considering the geographic origins of the 147 people, the biologists were even able to determine where Eve lived: samples from those of sub-Saharan African descent showed the most intragroup differences, implying that their mtDNA had had more time to change and thus that their ancestors arose earliest. This finding plus the structure of the family tree indicated sub- Saharan origin, a conclusion that agrees with current archaeological and anthropological theory...
...Sub-Zero Hero...
...true. Just by showing a teaching fellow that the writer is conscious of a paper's internal structure, grades can go up. Especially with essays longer than five pages, sub-titles every few paragraphs help to break up the monotony of lengthy text. This in turn shows a grader that thought has gone into the organization of an essay, and it serves as a guide for the grader's reading and evaluation...
Then, on the eve of the doomed launch, 15 Morton-Thiokol engineers agreed--unanimously--that NASA shouldn't launch the Challenger. They were fearful that overnight sub-freezing temperatures at the Kennedy Space Center would prevent the O-rings from functioning properly. (Morton-Thiokol had never bothered to test the rings' performance at such low temperatures...
Created in 1947, the National Security Council (NSC)--composed of the President and Vice President together with the secretaries of state and defense--was designed to be the principal forum for deciding key foreign and defense policies. A small staff, headed by the sub-cabinet National Security Advisor--or, more formally, the Assistant to the President for National Security Affairs--was created to assist...