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create a sudden bright flash of light, and no extant historical records of the time mention
such a flash. Some surviving Asian historical records of the time, however, mention a
loud boom that would be consistent with a volcanic eruption. Therefore, the cooling was
probably caused by a volcanic eruption.
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28) The following appeared in a newspaper article published in the country of Corpora.
"Twenty years ago, one half of all citizens in Corpora met the standards for adequate
physical fitness as then defined by the national advisory board on physical fitness.
Today, the board says that only one quarter of all citizens are adequately fit and suggests
that spending too much time using computers may be the reason. But since overall
fitness levels are highest in regions of Corpora where levels of computer ownership are
also highest, it is clear that using computers has not made citizens less physically fit.
Instead, as shown by this year's unusually low expenditures on fitness-related products
and services, the recent decline in the economy is most likely the cause, and fitness
levels will improve when the economy does."
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29) The following appeared in a letter to the editor of a newsletter on health issues.
"For the past decade, most health experts have advised teenagers to avoid eating greasy
foods in order to prevent acne and related skin conditions, but the number of teenagers
who sought medical help for these skin problems has actually risen over the same
period. In a recent study, teenagers who avoided greasy foods for a month reported
approximately as many outbreaks of acne and related skin conditions as did those who
ate an average of two servings of greasy food per day. Such data indicate that eating
greasy foods is unlikely to be a cause of acne and related skin conditions. Therefore,
health experts should no longer recommend that people avoid such foods."
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30) From a draft textbook manuscript submitted to a publisher.
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