Kenyan officials worry that the Dadaab camp, which already has over 400, 000 registered refugees, is going to mutate into a Somali city inside its borders.

肯尼亚官员担心已经容纳了四十万注册难民的Dadaab难民营会演变为肯尼亚境内的一个索马里城镇。

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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