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Low-energy lightbulbs cost $3.50, have a life of nine years, and use about $1.60 of electricity a year. Conventional lightbulbs cost only $.50, but last only about a year and use about $6.60 of energy. If the real discount rate is 5%, what is the equivalent annual cost of the two products?
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Radiation and chemotherapy drugs preferentially kill cells that divide frequently, most notably cancer cells. These cancer treatments also cause hair to fall out. Why?
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