He told BBC News that ice-coring "doesn't really work as a viable technique to do long-term, clean access and exploration of sub-glacial lake environments - because of the issues with cleanliness and sterility".

BBC: 'New frontier' of Antarctic lake exploration

Far from undermining confidence in the cleanliness of markets, unfettered short-selling limits the number of investors that will buy into what is false.

FORBES

Lastly, China points to its impressive improvements in energy efficiency and coal-plant cleanliness in recent years, and its increasingly ambitious commitments to invest in renewable energy sources.

ECONOMIST: America and China talk climate change

"No, I'm not just advocating credit cards: I'm just saying that consumers are increasingly flocking to other forms of payment -- not only for cleanliness, obviously, but for ease, for convenience, for lots of reasons, " Mastercard's Fam said.

CNN: Dirty money? Check your wallet

Start at World Cafe Live (WCL), a three million dollar space with two stages and incredible acoustics that marries the size, sophistication and cleanliness of an upscale theatre with a friendly, down-to-earth vibe.

BBC: Philadelphia��s musical roots

It is hard to remember that when the 20th century began, the car was seen as a move towards cleanliness: the manure, urine and carcasses that horse-drawn transport left behind in big cities were not only unpleasant and costly to clear up, but also helped spread disease.

ECONOMIST: A Survey of the 20th Century

Dr Hunter said the en-suite wet rooms were better for cleanliness and therefore better for infection control.

BBC: Derriford Hospital's ?3m stem cell isolation unit praised

The government would grant clean energy credits to operators of non-coal power plants on a scale according to the cleanliness of their generation.

FORBES: Billionaire George Kaiser Has A Big Green Energy Plan

His aim has been to run a low-cost airline with high standards, both in terms of cleanliness and reliability.

CNN: Is ego the reason for India's airline woes?