and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. ask your doctor about viagra. ugh... try al. did someone say burn? try alka seltzer reliefchews. they work just as fast and taste better than tums smoothies assorted fruit. mmm... amazing. yeah, i get that a lot. alka seltzer heartburn reliefchews. enjoy the relief. denver international is one of the busiest airports in the country. we operate just like a city and that takes a lot of energy. we use natural gas throughout the airport - for heating the entire terminal generating electricity on-site and fueling hundreds of vehicles. we're very focused on reducing our environmental impact. and natural gas is a big part of that commitment.