Ask the Experts (Scientific American Special Online Issue by Scientific American

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Carlos Santiago, Dominican Republic The duration of survival without food is greatly influenced by body weight, genetic variation, other health considerations and, most important, the presence or absence of dehydration. Without liquids or food, people typically perish after 10 to 14 days. ) This situation comes up frequently in two medical groups— the incompetent, terminally ill patients for whom artificial maintenance of life is no longer desired and the individuals who, though not necessarily terminally ill or incompetent, decide to refuse food and hydration to end their own lives.

Consequently, bumblebees pollinate these crops much more efficiently than honeybees do. COPYRIGHT 2005 SCIENTIFIC AMERICAN, INC. DECEMBER 2005 M AT T COLLINS Claude T.

The author would like to thank Kay Bogart for her help in preparing this answer. COPYRIGHT 2005 SCIENTIFIC AMERICAN, INC. DECEMBER 2005 M AT T COLLINS Arthur Lerner-Lam, associate director for seismology, geology and tectonophysics at the Lamont-Doherty Earth Observatory at Columbia University, explains: — J. ASK THE EXPERTS Q Why is life expectancy longer for women than it is for men? —E. Baierl, Lake Elmo, Minn. Bertrand Desjardins, a researcher in the demography department of the University of Montreal, explains: 32 SCIENTIFIC AMERIC AN E XCLUSIVE ONLINE IS SUE COPYRIGHT 2005 SCIENTIFIC AMERICAN, INC.

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