Question: What is the wettest thing on earth?

Sam Geen answered on 11 Nov 2020:

Well, my first answer was “ha ha ha” and then “water of course” but it actually turns out that there’s a physical property called “wetting” that has an actual definition, which is basically how able it is to keep contact with a surface.

As far as I can tell, if you have a water drop on a surface, you might find it sticks up a bit, because the water has surface tension. Things like “surfactants” (think soap) can make things “wetter”.

Practically, you can use this to control how products work like this paper talking about pesticides on tea leaves: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6600537/. But personally I think “water, duh” is a fine answer. Or indeed “me after a 10 minute bike ride in typical Dutch weather”.