But over time some of these harmless cancers mutate and turn aggressive, growing so much they can be detected in a biopsy.
FORBES: Men, Cancer, & Hope
Antibiotics lose their effectiveness over time, as bacteria naturally evolve and mutate, becoming resistant.
WSJ: WHO Calls for Action on Superbugs
Chinese scientists are concerned over whether the new H7N9 bird flu will mutate and pose a bigger threat, Global Times reports.
BBC: China media: Views on North Korea
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