There are many forums like that, especially if you’re not limited to one language. Most of the ones I frequent have been around for 10 or 20 years or more, but kind of fly under the radar. ilxor being a very good example. AFAIK, the latter also adds only one new user per day. I’d say that’s a good thing, even though I had to apply several times.

Depends? Liquid nitrogen can freeze a lot of vibrational degrees of freedom in place, but if you want molecular rotations to stop as well, there’s no way around He.

On a side note, that movie about him was A LOT better than I would have imagined.