@l10lin
@lemmy.worldSurely their price is considerably low, but given the limited locations where people can actually get access to the water, it is not that cheap. Imagine waiting in line with your mobile phone and your cup to get a little sap. You would want a huge water tank to cut down the frequency of fetching water. Good for motorhome users though.
Lenovo starts up in China actually, so there is no "Chinese takeover". By that term you could mean IBM sold their personal computer business(ThinkPad, etc.) to Lenovo.
Definition of natural numbers is the same as non-negative numbers, so of course 0 is a natural number.
you were right, class solidification has been happening and has had an effect since long ago.