I'm here to say that if there's snow, skis win on practicality. Almost every winter, there's at least one day when you will have some people skiing to work in Oslo, a city of 700 000 inhabitants, with a metro system. Because when there's 10 cm of snow in the streets, skis are the quickest and easiest way to get anywhere.
I remember reading somewhere that mathematical symbols make up an “incomplete” written language (or something like that). I commonly formulate problems, or complete sentences using only mathematical symbols. From a linguistic perspective, what separates mathematical symbols from “complete” writing systems?
When I was cleaning a heatsink from an older laptop, the aluminum, and I think also a bit of copper, started to disintegrate very quickly and sometimes violently. I used a cleaning solution that was made for removing thermal paste and cleaning CPUs and PCBs. After some time, the only thing left of the heatsink was some grey...
I can’t get your images to load, but to me, a materials chemist, it definitely sounds like you’ve managed to dissolve the aluminium and copper by using an acidic solution. Presumably, the cleaning solution contains some electrolyte that should help dissolve oxides, but if the solution is corrosive enough to oxidise the aluminium and/or copper the electrolyte will make the reaction more aggressive by rapidly dissolving the protective oxide layer as it is formed, such that the aluminium/copper is further corroded.
To be fair, this is just speculation based on what I’ve read here. I could maybe give a better analysis if you let me know what solution you’ve used, and what the heat sink/paste were made of, and if I can get the pictures of the resulting product (“ash”) to load.
I mean, I’ve heard that you can typically only survive about three days without water, but what exactly causes your body to fail when you dehydrate too much?...
Salts are absolutely necessary for ordinary nerve- and muscular function. If you’ve ever sweated a lot without eating or drinking some salt solution you would notice your muscles start twitching, vibrating and cramping. After a while you can also notice getting light headed and blurry vision.
Source: Been in situations with plenty of water but no salt, and enormous amounts of sweat. Been in the same situations with access to salt for comparison.
xkcd #2940: Modes of Transportation ( sh.itjust.works )
xkcd #2940: Modes of Transportation...
After seeing the photo of a hammerhead skull today: Can someone tell me what evolutionary pressure caused it? What is the advantage of the hammerhead skull shape?
Desalination system using water columns for low presure low temprature boiling with minimal energy losses ( www.scirp.org )
Linguists: Mathematical writing vs. Typical written language, what's the difference?
I remember reading somewhere that mathematical symbols make up an “incomplete” written language (or something like that). I commonly formulate problems, or complete sentences using only mathematical symbols. From a linguistic perspective, what separates mathematical symbols from “complete” writing systems?
Hi, can someone explain to my small brain what reaction this is or what happened? ( imgur.com )
When I was cleaning a heatsink from an older laptop, the aluminum, and I think also a bit of copper, started to disintegrate very quickly and sometimes violently. I used a cleaning solution that was made for removing thermal paste and cleaning CPUs and PCBs. After some time, the only thing left of the heatsink was some grey...
Dehydration: How exactly does it kill you?
I mean, I’ve heard that you can typically only survive about three days without water, but what exactly causes your body to fail when you dehydrate too much?...