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Jan
23
comment What is the safest and most effective additive to keep drinking water from freezing?
The problem is the reduction depends on the molar amount of the additive, so you only do quite well with substances whose molar mass is low. And then, even NaF with a very low molar mass is necessary in huge amounts to have any significant effect.
Jan
23
comment What is the safest and most effective additive to keep drinking water from freezing?
Please note that if there is nothing obviously wrong with my answer and you do not explain what is wrong with it, I ignore the downvote. Thanks.
Jan
22
comment Sticks leaning on a tree building a hut-like formation - what's the purpose of that?
Were they long? More than 5 meters? If so, they were likely teepee (tipi) sticks. They are commonly stored this way all around the Czech Republic and some neighboring countreis; remember that there's probably more than a 1000 scout campsites here, most featuring teepees.
Jan
22
comment How to warm up your cold toes and fingers?
+1 This is a very important answer, so I better repeat the crucial point: When your toes start to freeze, make sure you've eaten enough!
Jan
22
awarded  Editor
Jan
22
revised What is the safest and most effective additive to keep drinking water from freezing?
added 15 characters in body
Jan
22
awarded  Teacher
Jan
22
answered What is the safest and most effective additive to keep drinking water from freezing?
Dec
3
comment Is killing fish with iced water really humane?
For humans for instance, most people who freeze to death first can't fall asleep from cold, only to get into a koma from the coldness and never wake up. But for the fish that survives it, the waking up is very likely quite painful. (Anyway, I don't say anything for sure nor provide any evidence.)
Dec
3
comment Is killing fish with iced water really humane?
@phresnel Remember that every cell contains water. The ice is going to form near the sensory neurons as well, and ice formed in blood can activate the sensory neurons, so you can feel the ice forming as pain. The only question is: Is the fish put asleep from coldness before the pain starts? Maybe yes, maybe no.
Jun
14
awarded  Supporter
Jun
14
comment Where to keep valuables when separated from them
I'm not a mod, yet this looks like a really well-formed answer :)
Jun
14
awarded  Autobiographer