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.
This surreal place is blistered with meteorite craters - at least 26 cover an area of just 3 km by 19.2 km (1.8 x 11.9 miles), the largest measuring 115 by 91 metres (377 x 298 feet), thought to have been impacted by a powerful meteor shower between 4,200 and 4,700 years ago.