Amusing Science

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Anaxagoras
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Re: Amusing Science

Post by Anaxagoras »

Alternative link

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Abdul Alhazred
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Re: Amusing Science

Post by Abdul Alhazred »

Anaxagoras wrote:
Tue Dec 04, 2018 10:44 am
Hope I did the tags right.
I see nothing.

Got an http link I can follow?
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Anaxagoras
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Re: Amusing Science

Post by Anaxagoras »

Abdul Alhazred wrote:
Tue Dec 04, 2018 2:24 pm
Anaxagoras wrote:
Tue Dec 04, 2018 10:44 am
Hope I did the tags right.
I see nothing.

Got an http link I can follow?
https://gfycat.com/dizzyhandycattle
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

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Witness
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Re: Amusing Science

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Lactating spiders:
Prolonged milk provisioning in a jumping spider

Abstract

Lactation is a mammalian attribute, and the few known nonmammal examples have distinctly different modalities. We document here milk provisioning in a jumping spider, which compares functionally and behaviorally to lactation in mammals. The spiderlings ingest nutritious milk droplets secreted from the mother’s epigastric furrow until the subadult stage. Milk is indispensable for offspring survival in the early stages and complements their foraging in later stages. Maternal care, as for some long-lived vertebrates, continues after the offspring reach maturity. Furthermore, a female-biased adult sex ratio is acquired only when the mother is present. These findings demonstrate that mammal-like milk provisioning and parental care for sexually mature offspring have also evolved in invertebrates, encouraging a reevaluation of their occurrence across the animal kingdom, especially in invertebrates.
http://science.sciencemag.org/content/362/6418/1052 (rest behind paywall)

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Witness
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Re: Amusing Science

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Witness
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Re: Amusing Science

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↑ Going slightly farther back in time, the cosmic origins of the elements:

Image
https://commons.wikimedia.org/wiki/File ... _table.svg

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Anaxagoras
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Re: Amusing Science

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Witness wrote:
Thu Dec 20, 2018 1:19 am
↑ Going slightly farther back in time, the cosmic origins of the elements:

Image
https://commons.wikimedia.org/wiki/File ... _table.svg
It's amazing to me if you stop to think about what sorts of calculations would be necessary to figure all of this stuff out. Completely beyond me.

But like, they can predict what kinds of elements would be created inside a nova or a supernova, or an exploding white dwarf, or two neutron stars colliding. :notsure:
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Witness
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Re: Amusing Science

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Or the Big Bang. Gamow did that quite some time ago.

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Bruce
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Re: Amusing Science

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The formation of hydrogen was an amazing cosmological balancing act. If things had leaned one way, then there would have been no matter at all, just expanding energy. If things had leaned the other way, then the big bang would have collapsed back into a singularity. Di-atomic hydrogen just happens to be the perfect balance between attractive and repulsive forces. Just enough repulsion between the two protons to keep them from slamming into one another, and just enough attraction between the protons and electrons to keep them from flying apart.

That reminds me.....my 20 year anniversary is tomorrow. I suppose I better pick up something for Mrs Bruce on the way home. :shock:
Such potential!

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Abdul Alhazred
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Re: Amusing Science

Post by Abdul Alhazred »

I note that naturally occurring plutonium exists.

Didn't know that.
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Anaxagoras
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Re: Amusing Science

Post by Anaxagoras »

The only ones that are not naturally occurring have half lives that are extremely short. Fractions of a second. I think they do occur naturally but they just don't last long. Plutonium on the other hand has several isotopes with long half lives.
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sparks
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Re: Amusing Science

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Abdul Alhazred wrote:
Thu Dec 20, 2018 10:06 am
I note that naturally occurring plutonium exists.

Didn't know that.
Any naturally occurring Plutonium on Earth would long ago decayed into something else before we showed up to claim it for weapons use. So, while it does occur naturally, there is none on our planet. Wonder how often neutron stars merge? Before the Pu can get much of anywhere, it's decayed to something else.

Interesting study though. I was under the impression that all the elements were synthesized in super nova. With the exception of H and He.
You can lead them to knowledge, but you can't make them think.

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Witness
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Re: Amusing Science

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There is one known case of a natural nuclear reactor:
Wikipedia wrote:A natural nuclear fission reactor is a uranium deposit where self-sustaining nuclear chain reactions have occurred. This can be examined by analysis of isotope ratios. The existence of this phenomenon was discovered in 1972 at Oklo in Gabon by French physicist Francis Perrin. The conditions under which a natural nuclear reactor could exist had been predicted in 1956 by Paul Kazuo Kuroda. The conditions found were very similar to what was predicted.

Oklo is the only known location for this in the world and consists of 16 sites at which self-sustaining nuclear fission reactions are thought to have taken place approximately 1.7 billion years ago, and ran for a few hundred thousand years, averaging probably less than 100 kW of thermal power during that time.
https://en.wikipedia.org/wiki/Natural_n ... on_reactor

It's old, so the produced plutonium has disintegrated since.

For a lot of quacks it's Ancient Aliens™, of course.

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Re: Amusing Science

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Forgot about that one Witness. Thanks!
You can lead them to knowledge, but you can't make them think.

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Witness
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Re: Amusing Science

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Image

Gravitational waves! :shock:

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Witness
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Re: Amusing Science

Post by Witness »

Hmmm... Searching for a title. "Popular rocket science"? "Thai space program"?



But 'tis awesome! :)

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Witness
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Re: Amusing Science

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In 1908 Dr Ludovic O’Followell published a treatise on Corsets. Tu illustrate the health dangers he had X-rays made:

Image

Image

More: http://www.laboiteverte.fr/les-corsets- ... s-x/?l=sb1

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Bruce
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Re: Amusing Science

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Those are some child bearing hips.
Such potential!

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sparks
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Re: Amusing Science

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Did you mean 'birthing' hips?

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Witness
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Re: Amusing Science

Post by Witness »

Take that, entropy! :mrgreen: