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'Science's Masters'

Most important advances in science come with a set of ethical dilemmas, but researchers must be careful to remain "science's masters" and not "at its mercy," says the Guardian's John Harris. Research into how the brain works, for example, could one day lead to treatments for disease and brain damage, but could also lead to brain manipulation for nefarious purposes. "The price of liberty may be eternal vigilance but we need science, not least because it is our most obvious source of the sort of innovation that saves lives and produces welfare," Harris says. "Our vigilance must be as much to ensure we don't stifle science as it is to be sure science remains our servant not our master."

The Scan

Pig Organ Transplants Considered

The Wall Street Journal reports that the US Food and Drug Administration may soon allow clinical trials that involve transplanting pig organs into humans.

'Poo-Bank' Proposal

Harvard Medical School researchers suggest people should bank stool samples when they are young to transplant when they later develop age-related diseases.

Spurred to Develop Again

New Scientist reports that researchers may have uncovered why about 60 percent of in vitro fertilization embryos stop developing.

Science Papers Examine Breast Milk Cell Populations, Cerebral Cortex Cellular Diversity, Micronesia Population History

In Science this week: unique cell populations found within breast milk, 100 transcriptionally distinct cell populations uncovered in the cerebral cortex, and more.