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Several areas come to mind immediately: stem cell research, animal testing for food and drugs, phone tapping for homeland security.
Each of these are a political hotbutton due to ethics.
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Stem cell research is a good one. It has the capability to save human lives by creating organs etc for people who need transplants, but it often requires that we use the stem cells of aborted foetuses. It is basically growing organs n stuff. This is a VERY vague description, look it up before discussing it in any detail.
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