The pathogenesis of ectopic gastric mucosa is a matter of debate between a congenital-embryological-and an acquired origin-consecutive to a gastroesophageal reflux (GER) like Barrett's esophagus -, the most commonly accepted theory being that these areas are embryological remnants.
Standard size latex filled helium balloons stay afloat for approx 8 - 12 hours, metallic helium filled balloons float for 2-5 days. I have found that a 36 latex helium filled balloon can stay afloat for a number of days due to the thickness of the balloon and the massive quantity of helium.
Buster said Airship used to pay $22 for 100 cubic feet of helium. Now that price is as much as $50. The zeppelin, which visited St. Louis last year, charges passengers $375 for 45-minute rides. TAPPING RESERVES. The Federal Helium Reserve provides 6 million cubic feet of helium a day and has been operating at full capacity for a year, Burton said.