Amusing Science

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Re: Amusing Science

Postby Witness » Fri Dec 22, 2017 5:05 am


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Re: Amusing Science

Postby sparks » Sat Dec 23, 2017 5:22 pm

Sublimed with Salmonelliac?

WTF? :)

Oh. It's alchemy. The first attempt, nay religion if you will, for chemistry. As you were. Before you were so unfortunately sublimated.
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Re: Amusing Science

Postby Witness » Sun Dec 24, 2017 5:31 am

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Re: Amusing Science

Postby Anaxagoras » Tue Dec 26, 2017 7:28 am

Makes sense if you think about it.
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Re: Amusing Science

Postby Abdul Alhazred » Tue Dec 26, 2017 10:14 am

Hmm. Is this right?

The center of gravity is falling at the speed expected for the mass of the slinky?
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Re: Amusing Science

Postby Anaxagoras » Tue Dec 26, 2017 11:14 am

Abdul Alhazred wrote:Hmm. Is this right?

The center of gravity is falling at the speed expected for the mass of the slinky?


That is correct.

The other thing to note is that the amount of stretch at the beginning is determined by gravity. If you held a slinky like that on the moon, where the gravity is only 1/6th as strong, initially it would be much shorter. On a more massive planet with stronger gravity, it would be stretched out longer.

I don't know if it's a coincidence that the bottom doesn't seem to move at all. Maybe that's just a function of how springy the slinky is, but I'm guessing it's just proportional to the amount of extension. The farther you stretch it, the faster the ends move when you release it. Unless you stretch it so far that you permanently warp the metal. Intuitively it seems right to me though.
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Re: Amusing Science

Postby Witness » Thu Dec 28, 2017 4:10 am

Anaxagoras wrote:I don't know if it's a coincidence that the bottom doesn't seem to move at all.

No. You can picture the release as a wave traveling down: as long as it hasn't reached the end, said end "doesn't know" about the release.




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Re: Amusing Science

Postby Bruce » Fri Dec 29, 2017 10:06 am

Perfectly describes what a typical day as a research scientist is like:
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Re: Amusing Science

Postby Witness » Fri Jan 05, 2018 4:08 am

There are hundreds of proofs of Pythagoras' theorem. but this one is kinda cute:

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Re: Amusing Science

Postby Witness » Sat Jan 06, 2018 3:26 am

Evolution & Human Behavior wrote:Different impacts of resources on opposite sex ratings of physical attractiveness by males and females

Abstract

Parental investment hypotheses regarding mate selection suggest that human males should seek partners featured by youth and high fertility. However, females should be more sensitive to resources that can be invested on themselves and their offspring. Previous studies indicate that economic status is indeed important in male attractiveness. However, no previous study has quantified and compared the impact of equivalent resources on male and female attractiveness. Annual salary is a direct way to evaluate economic status. Here, we combined images of male and female body shape with information on annual salary to elucidate the influence of economic status on the attractiveness ratings by opposite sex raters in American, Chinese and European populations. We found that ratings of attractiveness were around 4 times more sensitive to salary for females rating males, compared to males rating females. These results indicate that higher economic status can offset lower physical attractiveness in men much more easily than in women. Neither raters' BMI nor age influenced this effect for females rating male attractiveness. This difference explains many features of human mating behavior and may pose a barrier for male engagement in low-consumption lifestyles.
http://www.ehbonline.org/article/S1090-5138(17)30315-X/fulltext

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Re: Amusing Science

Postby Anaxagoras » Tue Feb 06, 2018 3:48 am

Thought experiment about what would happen if you took away all the microbes:

https://www.youtube.com/watch?v=80tPR5HH9Zo


I bet if there were no microbes in your gut, your poop would be quite different. The poop coming out would look a lot more like the food that went in. Maybe not. :notsure:
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Re: Amusing Science

Postby sparks » Tue Feb 06, 2018 6:12 am

Without Our Friends The Microbes, we would have evolved to deal with our food without their help. Perhaps.
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Re: Amusing Science

Postby Anaxagoras » Tue Feb 06, 2018 6:44 am

Or, more likely, we just wouldn't exist in the first place. I think microbes are a necessary intermediate step between no life and complex multi-cellular life.

Two things: the chloroplasts in plants and the mitochondria in animals (actually almost all eukaryotic organisms) can be thought of as separate species since they have their own DNA. But they didn't really get into that in the video.
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Re: Amusing Science

Postby sparks » Wed Feb 07, 2018 1:42 am

One of the many fascinating things they didn't cover (or perhaps didn't know about yet?) in my high school biology classes: Mitochondrial DNA. How the fuck does that work?

And then there's these fucking magnets...
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Re: Amusing Science

Postby Bruce » Wed Feb 07, 2018 5:18 am

They used to think that atoms were the smallest particle. Then it was protons, neutrons, and electrons, but those can be broken apart as well. And the distance between them is vast. It has become increasingly clear over the course of the years that there really isn't such a thing as a solid. What we think of as solids are really just combined fields of electrons repelling against each other, exactly the way magnets repel each other. When you take those fields away, the entire universe can be compressed into a tiny point.

Ergo, most people think I'm fat, but I tell them that it's mostly empty space. :D
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Re: Amusing Science

Postby Abdul Alhazred » Wed Feb 07, 2018 9:54 am

You could lose weight. At least for a little while.

Just find a down escalator, preferably one that faces west. :p
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Re: Amusing Science

Postby ceptimus » Wed Feb 07, 2018 12:23 pm

You need to travel east, not west, to reduce your weight. That's why most space rockets are launched eastwards.

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Re: Amusing Science

Postby Abdul Alhazred » Wed Feb 07, 2018 2:37 pm

ceptimus wrote:You need to travel east, not west, to reduce your weight. That's why most space rockets are launched eastwards.


Damn!

No wonder I've been having so much trouble losing weight. :wink:
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Re: Amusing Science

Postby Bruce » Wed Feb 07, 2018 10:50 pm

I know how to keep from gaining weight.

Don't move.

As you approach the speed of light, your mass increases, thus you gain weight.

The farther you are from the speed of light, the better. That's why I spend most of my time on the couch.

The only reason I'm gaining weight is because the damn earth is moving so fast. :(
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Re: Amusing Science

Postby Witness » Wed Feb 07, 2018 11:35 pm

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