roughly 500-2000m

Global coverage at 500-2000m resolution from satellite gravitometers represents a very cost effective middle ground between that huge effort and what is currently available, which is a patchwork of soundings that has gaps 10s to 100s of km thoughout much of the ocean. (See Fig 2 of [1]).

[1] Becker at al. (2009) http://topex.ucsd.edu/sandwell/publications/124_MG_Becker.pd...

I wouldn't call that particularly well-known.

That day, he took me to the top. He opened a steel door, and set up a 6' wooden ladder. He climbed up the ladder, and there was a 1' x 1' square that you could fit your head through. He stuck his head through, and said it wasn't that great. I knew he was playing it down, for my sake.

I asked him one more time if I could climb up and look.

He climbed down, picked me up, and he climbed the ladder, and put my head through the hole. The hole was unfinished, and it was dirty inside the space. I remember seeing a gum wrapper, and that fine construction dirt up there. Looking back it was probably Sheetrock dust.

I vaguely remember I could see the city, but the glass, or plexiglass, was dirty. It was neat though. The kids at school didn't believe me. He didn't want me to climb in, but I asked.

The best part of that day was being with my dad. We ate lunch, and my dad said, 'Well at least your mom took the wrapper off the cheese today.' (This was the late 60's, or 70's, and my mom hated being a homemaker.)

At worst there's a lot of 'low-quality' rambling, but usually I then tag the user as 'shitty poster' (my approach to categorization can be a bit odd) and I'll downvote the worst of the comments when I see them.

Could it be that after a certain number of heavily downvoted comments it causes an automatic shadowban? Or maybe some deleted or edited comments that were reason to do so?

If that's what HN is, congratulations: You just helped make it that way a little bit more.