Continuous positive airway pressure (CPAP) machines are used to maintain an open airway in patients diagnosed with obstructive sleep apnea. The machine functions by blowing pressurized air into the airway via mask at a setting determined by sleep study and prescribed by a physician.
Also the second largest impact structure on Earth, the 1.85 billion years old Sudbury crater in Canada, hosts world-class mineral deposits - in this case nickel-rich minerals that were melted and concentrated by the extreme heating caused by the impact.
Ubehebe (pronounced you-bee-hee-bee) Craters, located about 150 miles northeast of Bakersfield in Death Valley National Park, consists of at least a dozen overlapping volcanic craters. The largest crater is about 800 m (0.5 mi) wide and 250 m (800 ft) deep.