Health officials from an infection control team are trying to find the source.

BBC: Salmonella outbreak hits hospital

In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

BBC: Helium-huffing gibbons 'sing with soprano technique'

But should he proceed with regulations to control pollution from existing coal-fired power plants, the single largest source of carbon pollution, those regulations probably will contribute to shuttering facilities already struggling to compete with cheap natural gas.

NPR: PROMISES, PROMISES: Climate Change

"Open source gives a level of control that proprietary software from the likes of Microsoft and HP do not give, " explains Kusnetzsky.

BBC: Linux takes on MS in China