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.
Kariba dam is the biggest dam in the world by reservoir capacity. Bratsk Dam in Siberia has a water storage capacity of 169.27 billion cubic metres. Akosombo dam, which creates the Lake Volta, has 144 billion cubic metres of storage capacity.