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.
Olympus Mons, the largest volcano on Mars, is so big that it can be seen with many common backyard telescopes. The largest active volcano on Earth is Mauna Loa in Hawaii, which has erupted off and on for the past 700,000 years. But it is about 2,000 square miles in size, a tiny fraction of Tamu Massif.