Amusing Science

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Witness
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Re: Amusing Science

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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

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Perfectly describes what a typical day as a research scientist is like:
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There are hundreds of proofs of Pythagoras' theorem. but this one is kinda cute:

Image
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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- ... X/fulltext

:mrgreen:
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Re: Amusing Science

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




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

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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

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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

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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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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

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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

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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

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Image
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Image

Image
Precise Metallic Replicas of Ancient Fossils and Cells by Allan Drummond

Each creature is sculpted digitally by Drummond using scientific references, including specimens from private collections. Next, they are 3D printed in wax, and finally lost-wax cast in bronze and finished by hand. The sculptures are rendered down to the smallest detail, including gills, antennae, legs, and even mitochondria in cell division.
Details & more pics: http://www.thisiscolossal.com/2018/01/p ... d539db565e
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Re: Amusing Science

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sparks wrote: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...
Here's a nice story about mitochondria: https://www.reddit.com/r/AskReddit/comm ... t/du13k9x/.
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An explanation (a bit lengthy): https://www.youtube.com/watch?v=cUCSSJwO3GU

I remember a SF story using that trick. Abdul?
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Re: Amusing Science

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First attempt at ball-bearings. They do, however require special lubrication: The blood of small children.
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Re: Amusing Science

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Abdul Alhazred wrote:Not off hand.
I just remember that some starship crashed on a planet where the circle was sacred, so the crew couldn't use logs for moving their machinery. Until they thought of this geometric trick (using 1/3 of a circle was OK). :mrgreen:
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Re: Amusing Science

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Get a load of this crazy airplane:



Only a taxi test, it hasn't gone airborne yet, but wow, that's an interesting airplane design.

https://www.theverge.com/2018/2/28/1706 ... test-video
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I keep thinking it will split down the middle.

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Re: Amusing Science

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Abdul Alhazred wrote:Not off hand.

I suppose those are just show pieces, and spheres aren't going away any time soon.
It's not without its applications however.

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Ah yes. The good ol' Wanker!
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Re: Amusing Science

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Not really science, but a technology I found amusing:



Somewhat repetitive timelapse:
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Re: Amusing Science

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I guess this goes here.

Image

Exactly how big are these? It's a little hard to tell because there's no people up on top to give a point of reference, but each one of those blades is longer than a football field. 117 yards long to be precise (107 meters). Those fences are probably about as tall as a person.

They are rated to generate 12 MW of electricity.

Image

https://www.vox.com/energy-and-environm ... rgy-blades

There's some interesting talk about capacity factors:
This quote from the Department of Energy’s 2016 Wind Technologies Market Report shows how wind capacity factors have evolved over time: “The average 2016 capacity factor among projects built in 2014 and 2015 was 42.5%, compared to an average of 32.1% among projects built from 2004–2011 and just 25.4% among projects built from 1998 to 2001.”

By way of comparison, in 2016 the US nuclear fleet had an average capacity factor of around 92 percent. (Given current markets, nuclear is only economic when running continuously, as baseload.) Coal and natural gas were 55 and 56 percent respectively. (Natural gas is that low because it frequently ramps up and down to follow swings in demand. Coal used to be up close to 80, but it is less and less economic to run coal plants at all.)

So modern US wind is up to 42.5 percent and natural gas is at 56 percent. The Haliade-X, according to GE, will have a capacity factor of 63 percent. That is wackadoodle, though it wouldn’t be the highest in the world — the floating offshore turbines in the Hywind Scotland project hit 65 percent recently.

Add all that up and, at a “typical German North Sea site,” GE says, each Haliade-X will produce about 67GWh annually, “enough clean power for up to 16,000 households per turbine, and up to 1 million European households in a 750 MW windfarm configuration.” (Suffice to say, the number would be smaller for energy-profligate American households.) That’s “45 percent more energy than any other offshore wind turbine available today,” according to the company.
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Re: Amusing Science

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These comparisons ...
By way of comparison, in 2016 the US nuclear fleet had an average capacity factor of around 92 percent. (Given current markets, nuclear is only economic when running continuously, as baseload.) Coal and natural gas were 55 and 56 percent respectively. (Natural gas is that low because it frequently ramps up and down to follow swings in demand. Coal used to be up close to 80, but it is less and less economic to run coal plants at all.)
Make it appear that wind is on par with coal and natural gas. But in fact the comparison is at best apples and oranges. Coal for example has a lower capacity factor because one decides to turn it down. Wind has a lower capacity factor because the wind stops blowing. A coal plant with any given nameplate capacity can be run at >100% as necessary and any downtime can be scheduled. Same with nuclear, natural gas, hydroelectric, and even geothermal. Decidedly not so with wind unless the wind decides to cooperate; it is unpredictable.

Therefore, for every unpredictable KW of wind that you build, you have to build a KW of something reliable to back it up. As such, you pay for your power twice even if you only need the energy once; every KW/h of energy produced will have two KW of potential behind it. What you save in fuel may pay for that but the energy bills certainly don't reflect any savings.
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↑ That's kW.h or kWh, not kW/h.

Wit – pedantic asshole – ness.
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Re: Amusing Science

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Spoiler:
Emergency fire extinguisher at Kennedy Space Center.
And you can try to simulate it in your kitchen:

Image
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Image
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(I have the same glasses, but without this crawling chaos…)
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Re: Amusing Science

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whatthefuckisthat?
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arXiv.org wrote:The Silurian Hypothesis: Would it be possible to detect an industrial civilization in the geological record?
Gavin A. Schmidt, Adam Frank
(Submitted on 10 Apr 2018)

If an industrial civilization had existed on Earth many millions of years prior to our own era, what traces would it have left and would they be detectable today? We summarize the likely geological fingerprint of the Anthropocene, and demonstrate that while clear, it will not differ greatly in many respects from other known events in the geological record. We then propose tests that could plausibly distinguish an industrial cause from an otherwise naturally occurring climate event.
https://arxiv.org/abs/1804.03748

Amusing article on the subject: https://www.theatlantic.com/science/arc ... on/557180/
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Re: Amusing Science

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OK, that's fun.

What's the trick?



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Re: Amusing Science

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Weird. It almost looks impossible without some sort of trickery.

You gotta watch to the end of the gif to briefly get a glimpse of the actual shape of whatever that is.
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It's a matter of perspective. Any other angle save the one it was photographed at would give it away immediately.
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Re: Amusing Science

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It's still fucking awesome
still working on Sophrosyne, but I will no doubt end up with Hubris
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Viscous liquid syphoning itself. 8)
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Some aerodynamics:

Image
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Re: Amusing Science

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Fun with tuned circuits! One of my personal favs.
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