Scientists fight back in 'mutant flu' research row

Leading virologists on Wednesday warned of censorship after a US bioterror watchdog asked scientific journals to withhold details of lab work that created a mutant strain of killer flu.

Air pollution levels drop in China: Greenpeace

Air pollution levels in some of China's smoggiest cities fell by nearly a third in the first quarter of this year, environmental campaign group Greenpeace said on Tuesday.

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