Cool Science thread

[Norseman]

yeah that was frustrating

[The Suit]

Cuttlefish like marshmallows.

https://www.livescience.com/cuttlefi...llow-test.html

[Viva]

The illusion is caused by a meteorological phenomenon called a temperature inversion. Normally, the air temperature drops with increasing altitude, making mountaintops colder than the foothills. But in a temperature inversion, warm air sits on top of a band of colder air, playing havoc with our visual perception. The inversion in Cornwall was caused by chilly air lying over the relatively cold sea with warmer air above.

Because cold air is denser than warm air, it has a higher refractive index. In the case of the “hovering ship”, this means light rays coming from the ship are bent downwards as it passes through the colder air, to observers on the shoreline. This makes the ship appear in a higher position than it really is – in this instance, above the sea surface.

[BCMtnHound]

The Flying Dutchman!

[Meathelmet]

Myons not doing their Myony Myoning stuff like they should, baffling physicists.


https://www.nytimes.com/2021/04/07/s...rookhaven.html

[Mazderati]

Good stuff. Bit of frequency illusion for me reading that article. Learned about muons for the first time the other week.

[mtnjam]

Myons not doing their Myony Myoning stuff like they should, baffling physicists.


https://www.nytimes.com/2021/04/07/s...rookhaven.html

So the rabbit hole does go deeper. Pretty much what I suspected. I wonder how these experiments would look in different gravity or a different universe. Someone or something isn't wanting us humans to really know what is going on and the deeper we go the deeper we get into the simulation, but most likely we are seeing the effects of a human construct called time and other far reaching dimensions.

[Cruiser]

This is probably as good a thread as any for this vid. Money playing pong no handed using only his brain (and the neuralink) to control the game.

https://youtu.be/rsCul1sp4hQ

[Dantheman]

So the rabbit hole does go deeper. Pretty much what I suspected. I wonder how these experiments would look in different gravity or a different universe. Someone or something isn't wanting us humans to really know what is going on and the deeper we go the deeper we get into the simulation, but most likely we are seeing the effects of a human construct called time and other far reaching dimensions.

You may, possibly, be speculating excessively.

This is probably as good a thread as any for this vid. Money playing pong no handed using only his brain (and the neuralink) to control the game.

https://youtu.be/rsCul1sp4hQ

Far upper-right on the Cool/Terrifying matrix.

[Meathelmet]

This is probably as good a thread as any for this vid. Money playing pong no handed using only his brain (and the neuralink) to control the game.

https://youtu.be/rsCul1sp4hQ

Cruiser, how the fuck did you manage do misspell that particular word? You know, considering your icon...

[Cruiser]

Bwaaaaa! Freudian slip perhaps?

[m2711c]

we have the highground.... the martians cannot defeat us now.

[tetzen]

we have the highground.... the martians cannot defeat us now.

That's pretty badass. It's a shame the little helicopter will only last another 2 weeks at this point. I wish they could just keep it going for a few more years like they did with curiosity and the other rovers.

[ötzi]

You may, possibly, be speculating excessively.

Or not, though. The notion that we have any clue about what's going on is exactly as farfetched as any other. Obviously believing in a wysiwig universe helps from a practical standpoint though.

[ötzi]

Just heard about these guys - RF (wireless) charging: https://guru.inc Looks pretty slick and scaleable. I wouldn't mind having a few bucks invested in them.

[Dantheman]

Or not, though. The notion that we have any clue about what's going on is exactly as farfetched as any other. Obviously believing in a wysiwig universe helps from a practical standpoint though.

"but most likely we are seeing the effects of a human construct called time and other far reaching dimensions." is just word salad with no relation to the actual experimental results in question. What the Bleep?-type shit. Obviously, there most likely is all sorts of shit going on that we don't even know we don't know. But, time is no more a "human construct" than any of the spatial dimensions.

[ötzi]

Well, sure. If they exist, of course.

[Buster Highmen]

Well, sure. If they exist, of course.

[Buster Highmen]

One thing that has always bugged me about classical physics is the assumption that time is constant.

How do we know that billions of years ago, just after the big bang, time was going at the same rate? That might explain the red shift from which the expanding universe theory derives.
The measurements on which that's based come from events that happened a long, long time ago, so the dv/dt rate then might be different for the current dv/dt now because dt is different, not because the vector difference dv is.

[EWG]

10 points for pulling Morris Day into the equation with a perfectly on topic band and song name. Well done.

[Not DJSapp]

One thing that has always bugged me about classical physics is the assumption that time is constant.

How do we know that billions of years ago, just after the big bang, time was going at the same rate? That might explain the red shift from which the expanding universe theory derives.
The measurements on which that's based come from events that happened a long, long time ago, so the dv/dt rate then might be different for the current dv/dt now because dt is different, not because the vector difference dv is.

In classical (Newtonian) physics time is constant. Once you depart Earth, gravitation time dilation and other exciting effects are in play and time is no longer constant.

[Dantheman]

In classical (Newtonian) physics time is constant. Once you depart Earth, gravitation time dilation and other exciting effects are in play and time is no longer constant.

Yeah, are we talking about something beyond the known relativistic nature of time? Because a lot of things we have today like GPS wouldn't work if we didn't understand with stunning precision how time is anything but constant. Time doesn't exist if you're a black hole or a photon.

Beyond that though, arguing that time may have been nebulously "different" 10 billion years ago than it is now feels like saying photons or protons or the EM spectrum might have been "different." Not that that isn't possible, it's just that time doesn't seem any more likely to have been different than any of the others.

[Buster Highmen]

it's just that time doesn't seem any more likely to have been different than any of the others.

I don't mean to insist it be looked on that way.
I think of physics as modelling where some assumptions are held and consequences derived. It's like a game.

Like DJ said, in the Newtonian model, on which a lot of stuff like GPS relies, time is assumed to be constant, that's part of the rules, an assumption.

But people change the assumptions in order to explain phenomenon, so it's not really like one thing is more likely than something else. It's just that changing an assumption can given better explanations.

[Meathelmet]

Time doesn't exist if you're a black hole or a photon.

Photons do not experience "time" (but interacts in time) but black holes do through f.e Hawking radiation.


...Afaik...

[abraham]

This is pretty cool.

Contrary to Previous Belief, Strike-Slip Faults Can Generate Large Tsunamis

On September 28, 2018, an inexplicably large tsunami devastated the Indonesian coastal city of Palu and several others nearby. Between the tsunami and the magnitude 7.5 earthquake that caused it, some 4,340 people were killed, making it the deadliest earthquake that year.

The tsunami's waves reached around six meters high, which was a shock to geophysicists who had believed that earthquakes along a strike-slip fault could only trigger far smaller tsunamis for that particular region. Now, new research describes a mechanism for these large tsunamis to form, and suggests that other coastal cities that were thought to be safe from massive tsunamis may need to reevaluate their level of risk.

Most large tsunamis are triggered by earthquakes along thrust faults, where one piece of crust is shoving its way over the top of another. Motion along such a fault creates a large vertical displacement, which, when the fault is under water, generates massive waves.

https://www.caltech.edu/about/news/c...large-tsunamis