So this is Ukrainians killing Nazis again? WWII part ii?

The 1000 genome project used populations around the world

http://ftp.1000genomes.ebi.ac.uk/vol1/ftp/README_populations.md

Has a list of the ones used.

Actually there were two competing approaches at the beginning. Venter did sequence himself with shotgun sequencing, while the high fidelity BAC sequencing with Sanger sequencing was done on a range of different individuals spanning the genome.

So the first version of the reference was a mixture of them all.

Say a certain position is a A for 90% of people, but a C for 10%. The A variant is more common than the C.

So when the reference had previously had a C there, in a later version it's often been changed to the most frequent base.

It's no one person's. It's a mishmash of several different high quality genomes, and then over time it's been changed to have the more common variants as the reference rather than the reference being a rare mutation for some genes.

Presumably geothermal vents can heat up water which can send it rising?