Word: threshhold
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Dates: during 1960-1969
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...first of all, the notion of heretability as a quantity separable from environmental influence is at best questionable. The interaction between gene structure and environment is a complex one, and Jensen has not sufficiently isolated one factor from the other. He argues, for instance, that environment operates as a threshhold variable in affecting development. Below a certain minimum threshhold of environmental benefits, the genetic potential of an individual does not develop, and cannot be considered an important variable in determining IQ. But Jensen never quantifies the threshhold level. He merely indicates, somewhat arbitrarily, that minority-group students are not below...
...delicate an instrument is the human ear that at certain frequencies it can discern sound that moves the eardrum a distance only one-tenth the size of a hydrogen atom. The close-up roar of a jet engine amounts to one million billion times this threshhold level; this causes actual pain and soon brings on permanent deafness. Sound vibrations are transmitted by the eardrum and ossicle bones to the inner ear, a bony and membranous structure lined with tiny hairs that connect to the brain's auditory nerve. It is these hairs that are damaged most in noise-induced...
Well, I do know, of course, and so does everybody else. Clay (or Muhammed Ali, if you wish) is on the threshhold of becoming the greatest heavyweight in the history of the ring. Floyd Patterson, Clay's opponent in Las Vegas tonight, will open the door just another crack. That's all; nothing more, nothing less...
What's in a class? Few Harvard undergraduates, even those on the threshhold of the Outside World, would claim they felt much sense of class. The one discernible--and perhaps only--unifying force for any class remains the common four years spent in Cambridge...