Really is.

https://en.wikipedia.org/wiki/Partition_of_a_set?wprov=sfla1

The sets in [partition] P are called the blocks, parts, or cells, of the partition.

The number of cells in partition is >= 1.

Marx didn’t anticipate information technology. Because of IT, we are moving to a new regime of humanity. The automation of action is part of the reason, but the most important is the ability of any group of people to communicate. The control of broadcast underpins the prior structures of power. Now, anyone can reach everyone, and we are watching the power of the state erode in the rise of fascism globally.

Yes.

It was fairly fragmented but hardly a whole lot of nothing.

The reason for 12-hour clocks is most cultures worldwide have variable length hours of over a year. For Western times this comes from Greeks who had 12 day and 12 night hours. Early water clocks in antiquity would attempt to make that adjustment automatically.