Researchers from the National Jewish Medical and Research Center in Denver, US, found that the hormone caused a drop in lung function in asthmatics.

BBC: NEWS | Health | Sleep supplement asthma warning

On good days, the wind will start somewhere around Denver and blow us eastward across the state.

WSJ: A Ride Across Iowa

Lee's calling us from Denver, in Colorado.

NPR: Opinion Page: Network Neutrality on the Internet

Claudia with us from Denver, Colorado.

NPR: Wall Street Woes: Who Gets A Bailout?

Wednesday's debate at the University of Denver was the first time voters across the US had the chance to see Mr Obama and Mr Romney on stage together.

BBC: US election: Obama and Romney debate economy in Denver

He joins us from the studios of Colorado Public Radio in Denver.

NPR: Invoking the State Secrets Privilege

The site lists hotels in 13 US cities: Atlanta, Boston, Chicago, Dallas, Denver, Houston, Las Vegas, Los Angeles, Miami, New York City, San Diego, San Francisco and Washington DC.

BBC: New ways to earn miles faster

NPR's Robert Smith sent us this audio postcard from the main gate of the Pepsi Center in Denver.

NPR: Postcard From Outside The DNC

"That leads to more business for us, " says Jeffrey Schwartz, chief executive of ProLogis, a warehouse REIT out of Denver.

FORBES: Magazine Article