Recent comments in /f/todayilearned

Thin-Rip-3686 t1_jdqup8u wrote

There’s only about a 3% difference in payload mass between the two.

Although it’s also been theorized that the lion’s share of the difference is because female embryos spontaneously die at a higher rate, there’s also the theory that eggs and sperm communicate with chemical messengers and eggs may prefer one sperm to another.

This set of preferences as well as the distribution of X vs. Y sperm also correlates to both parents’ stress and methylation levels- an easy life so far means creating males is better because if successful they’ll make more babies of their own, whereas a hard life so far means creating females is better because their success is a safer bet, even if they can’t make as many babies.

That logic may be backwards, or even reversed between sperm and egg.

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Svejkovat t1_jdqryhg wrote

To any fellow uofm grads that never heard this one,

the story goes...

Some time around 1959 Dominick DeVarti owned a few Dominick's pizzarias in Ypsilanti. He sold one of them to Tom Monaghan for 600 bucks. Dominick purchased (before, after, concurrently?) the site next to the law school in Ann Arbor and christened it as usual. He meanwhile forbade Monaghan from maintaining the name for his spot over the highway in Ypsi. It wasn't a franchise. I wonder how many times he'd later wished it was? One of Monaghan's delivery guys suggested Dominos instead. Close enough to connect with Dominick's already loyal customers. It stuck. And the rest is....

I've always wanted to believe that Dominick held no regrets. That he owned and operated a beloved, genuine, no bullshit, business that provided a slice of family away from home for many generations of students and faculty over the years. That could not ever have been said of Dominos, never mind it's billions.

Dominick's was a significant part of the props and scenery of my early 90's Ann Arbor days.

"Claudia! Let's get some Peronis!"

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The_Flurr t1_jdqqenn wrote

Sweat regulates temperature, it doesn't actively cool the body to lower than the temperature of the sweat. Your skin and sweat equalise in temperature until the sweat evaporates or is wicked away.

It's the same in all liquid cooling, the substance being cooled cannot be cooled beneath the temperature of the coolant.

Assuke the water in the space suit would be relatively consistent throughout its volume. The drop in pressure from being exposed to hard vacuum drastically decreases the amount of energy it needs to boil. So for each water molecule, some of its thermal energy will essentially be used to change state. It won't suck energy out of neighbouring particles to do so unless they are significantly hotter.

If the water were in a sealed chamber you might observe what you described, because the now cooler vapour would be contained with any remnants of liquid water. In open space however, the vapor would disperse too quickly for the vapor to take any meaningful amount of heat away.

I say this ironically while writing a report on the nitrogen cooled cryostat I made for a uni project.

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