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.
World's Largest Asteroid Crater Found in Australia. Scientists in Australia have discovered what they say is the largest asteroid impact area ever found on Earth. WSJ's Monika Auger reports. Photo: A. Clikson. This transcript has been automatically generated and may not be 100% accurate. been ... Shelly ... discover what they say is the law just outside ... the area ... that ... the four hundred km wide impact area ... in central Australia ... consists of two separate Paccar's scientists that ...