I was reminded recently of one of the more dumb-ass things I have done.
In one of the Armadillo Aerospace vehicles we ran an alcohol feed pipe through a liquid oxygen tank. It had an air gap jacket, but we were still concerned about the possibility of freezing the alcohol if there was an extended launch hold.
We did an experiment with a beaker full of ethanol in a liquid nitrogen bath, monitoring the temperature over time. The result was unexpected — the alcohol didn’t freeze solid, but it took on the consistency of a thick honey. We would pull the stir stick out and watch the viscous liquid slowly make its way down.
It was so mesmerizing that I… poked it. With my finger.
Liquid nitrogen is less dangerous than many people think — it isn’t like a Mr. Freeze gun. I had a high school science teacher that splashed some at students after doing the frozen flower demonstration. It flashes to gas and dissipates really quickly.
This was like reverse napalm. Super cold, sticking to my finger, and not evaporating or sliding away.
It was just a tiny drop, but it was instantly obvious I had made a mistake.
Only a tiny little patch of frostbite resulted, but it did drive a bit more caution later.
@ElliottBlackwe3 As others say, bots being removed may be a thing. The interpretation “Why did this account suddenly turn woke! Screw this!” doesn’t make sense. No one can really have been such deceived.
I want to tell you a story about an old man, with a silly name and ridiculous hair, who was born in New York, became a media personality and then a right wing politician. 🧵
@CultureCrave@DJSnM Actually, this means that the McDonalds franchisees can fix their machines. Previously central McDonalds corporate insisted that everything had to be done by official technicians. McD central almost certainly got kickbacks. It’s a good thing, but don’t give mcd any credit.
@Prune602 How the F am I supposed to know how large a stick is? A cup? Whose cup? My grandmother had an enormous cup she drank bad tea from. “Customary units” fill me with rage.
@Prune602 In my European ignorance, I knew about the different butter standards, but I’d assumed that they were at least the same weight, if different forms. Stupid of me.
We never considered London's motorway bridges to be beautiful before, but this series of paintings (and exhibition) is a real eye-opener https://t.co/qo6SbPOn9R
Foundation sacrifice refers to the practice of burying someone alive in the foundation of a new building with the belief that they would then become a spirit that guarded the same building that had become their tomb
https://t.co/3xtOOSiMS7