Another item is dating based on the stars. If you want to record a date you can record the position of the stars and planets. Such dating is attempted for the mahabharata and other Indian epics, but the language is very flowery so it is difficult to ascertain exactly.
Wasn't there a lot of economic instability in the soviet union? The Chinese leadership must have understood that and took on economic prosperity as the main way to preserve their government.
Breathing into water, per se, doesn't help. The air blown into the system is lightly pressurized, and this pressure helps inflate lungs just like inflating a balloon.
The water bottle is there because it's difficult to control the amount of pressure. Sinus tissues and lungs are very delicate, and pressurized air also messes with blood/gas ratios, so it's important to use the minimum pressure you can get away with. The bottle of water allows the pressure to be controlled simply and precisely, by adjusting the depth of the hose.
Basically, they don't have access to ventilators. The current recommendation still has a mortality rate of 1:7 but the bottle method seems to be around 1:56 (if I'm reading that right).
So, the order of preference is ventilator, shampoo bottle, then low-flow oxygen. In other words, what I said. This is a case of not having access to the best method, but having something that works better than the other secondary methods.
This will not and should not replace ventilators in modern hospitals, but in places where ventilators are unavailable, this is a good solution.
Now Rudy Giuliani, our country's cybersecurity adviser, says this is all a Twitter conspiracy.