fullsquare

if you do that you have bigger problems

suspending funding to an institution that designs your nukes is definitely a choice

just put butter in the toothpaste tube smh

only if you take notes

this advice is specifically about sulfuric acid. it's denser than water, so if added to it it will sink diluting itself along the way, while also heating water around and making it float to the surface. if done opposite way, water won't mix immediately because of large density difference so neutralizatio heat will be deposited on surface between these two boiling water and throwing acid around. this matters less with other acids because less heat is deposited, and in some cases acid is less dense than water. but if you stir the acid quickly, you can do it either way as long as you control temperature. this also is the case when you need to mix two different acids

tldr you can do whatever you want as long as you know what are you doing

e: i've checked and heat of dilution is greatest for sulfuric acid, liquid HF is similar per gram, gaseous HCl and HBr are half of that per mol, other common acids 5-10x less esp as aqueous solutions and not neat. also the same happens when diluting acids with other solvents, like alcohols or ethers, these might be even worse because they boil at lower temperature

at least they haven't crammed ai into it (so far, i guess)

speaking of oracle, they recently loaded up on debt and got into deals that are all but impossible to fulfill, and in a couple of years their survival will depend on openai making profit. (not revenue) put a pin in it and come back to that in a year or three

where i live it's a part of building code that hot water has to be hot enough that legionella doesn't survive in it. depending on the place it might be different and whether building is up to code is a separate thing entirely

legionella dies after 2min at 60C tho

depends on your buildings construction, if you have steel piping then it should be fine as long as you boil it. if it's chlorinated then it shouldn't even matter too hard

that's not a waste of energy, but i bet there was also other habit that is: unless you want to specifically evaporate water, things will get boiled just the same on low or high heat. (heating up to boiling point is most economical using high power) there's zero reason to keep thing boiling on high heat then add water. also, using hot tap water. water heater is much better at heating water than open gas flame, yet i see people insisting on heating entire pots and kettles of cold tap water

mormons got it covered lol. there's a fair bit of survivorship bias here