[basseq]

I go both up (I know all but 2 of my 16 g-g-grandparents, and 22 of my 32 g-g-g-grandparents) and down (I'm tracking 14+ generations of everyone descended from my 10th great-grandfather).

I'm the kind of person that likes 100% completion in my video games, so the idea of "filling in" all the gaps is satisfying to me. The amount of public records on BMD (birth, marriage, and death—the "holy trinity" of genealogical data points) is staggering in most countries. From census and SSA records in the U.S. to parish records in Scotland, you can find a lot of information.