As said above, RapidScat measured wind speed and relative wind direction. Scatterometers relate the reflected power (backscatter coefficient in the picture below) with the relative wind direction with a cosine dependency.
This means that there is an ambiguity when resolving the direction, as up to four different directions translate into the same ...
There are many papers on NASA NTRS called "Analysis Results for Potable Water for ISS" for various expeditions and time frames. I have not looked at all of them.
How often are the samples collected?
From the papers I skimmed, each Expedition brought back 2 - 4 samples. See tables below for examples.
If they are continuously collected, what ...
The author of that answer was confused by a poorly written NASA PR document.
The majority of the humidity control on the US part of the ISS is not done using silica gel. It is done using condensing heat exchangers called Common Cabin Air Assemblies.
The temperature and humidity of the International Space Station (ISS) United States On-orbit Segment (USOS) ...
Zero gravity does not restrict the evaporation of sweat.
On Earth the evaporation of water is enhanced by air movement like wind.
In zero gravity, there is no air circulation caused by thermal differences but the air in the ISS is circulated with ventilators. So the evaporation could not be reduced by zero air movement. Not to forget the body movement during ...
According to a COLUMBUS Module engineer I once spoke with, it is common practise to use "silica gel" (the stuff in the small white bags you get buying new shoes or bags or everything) extensively because as you mention humidity is dangerous for everything onboard the ISS.
I made a quick Google search for sources:
Clearing the Air in Space: ...
They keep the ISS at a pretty comfortable temperature and humidity level, so there's not much sweat accumulation except when they're working out. For that, they use towels.
The sweat that they do produce that evaporates (along with the water vapor they exhale) gets collected as part of the water processing system and recycled into drinkable water.