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A new study says one part of the human brain may become smaller as the result of a condition known as jet lag．Jet lag results from flying long distances in an airplane People with jet lag may feel extremely tired for several days．They may also have problems thinking clearly and remembering．
Recently a researcher at the University of Bristol in Britain reported the findings of his jet lag study，which involved twenty young women who worked for international airlines．They had served passengers on airplanes for five years．These flight attendants flew across many countries and at least seven time zones．In the study, the flight attendants had different amounts of time to recover from jet lag．Half the women spent five days or fewer in their home areas between long flights．The other half spent more than fourteen days in their home areas.高考资源网版权所有 ©2005-2009
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