prashna walata uttara

[sankapeiris]

ubalage prashna walata man ada uttara dennam. man hitana widiya ho karana dewal wenas karanna ba kiyala witarak mathaka thiyaganin.

1. wela web ekak thiyenne ai?

okata hethuwa kiriye genunwa expose karanna ba. wena ehema karanna thenak eththeth na. spa walata wiriddawa sahenna peminili kara eth nitiya kriyatmaka wenne na a nisa wena widiyakata mata awashyade karanna onawuna. spa wahanna berinam spa walata kello ena eka nawattanna ona.
ekata thamayi web ekak heduwe. thaniyama neweyi ape team ekak innawa.
eka haraha kellanwa expose karana eka karanne. ape aramuna "uba redda issuwoth ube iranama mehi wiyahekiyi" kiyana eka. oya web eke a gena lagadima banner ekak yayi. anitde oya web eken sata 5k hambakarala na. hambakaranna adahasakuth na.

2. eyi spa walata wirudda wenne wena weda nedda? uba higannekda? ube payya nagin nedda?

kollo man tharam spa walata giya ekek me lankawe neti taran. mata spa walata yanna onataram sallith thiyenawa. giyapu godak spa wala kellonta ukalamayi awe.
oya spa wala ahinsaka kello innawa man na kiyanne na. a godak kellonwa oya rasawata dala thiyenne "medam" yanuwen hadunwana geniyek saha ekige miniha. medam kiyana genige gedara tamayi kello 90%kma newatila inne. ubala danne neti wunata awrudu 16 kellonwath oya geni wikunanawa. belumgaleth me gena giya. hoyala ahapan. oya mahaparimana wayaparaya nawattana adahasa mata thiyenawa.

3. ai uba wela site wala link dunne? ai spa gena kiwwe? ai ewata palayan hoda keli innawa kiwwe?

wela link dunne expose kirime aramunen. kochchara kellange video demmath wedak na ewa lankawe ewun dakinne nettam.
spa gena kiyapu hema welema man kiwwa me spa eke mehema kellek innawa ekita me me dewal karanna puluwan kiyala. eth ekka kiwwa puluwannam record karala mata video eka diyan kiyala. mage aramuna wune ubala lawa spawala kellange video aran expose karana eka. ow balallu lawa kos eta bewima wage thamayi.



antimata kiyanawanam mama karanne samajeta yahapathak. eka ubala mona widiyata hithuwath mata kamak na.
mata manawa himikam ekenuth, buddi anshenuth, sinhala sanwidana kipayakinuth mata me wedeta sahayogaya lebenawa.
a nisa man karana wede nawattanna uthsaha karanna epa.
spa karana ewun innawanam parissam wela idapan. iye spa 3kata kelewwa.

 

[WhiteWalker]

What is there left to discover or explain about gravity?

Here are a few examples, some mysteries about gravity.

The question of quantum gravity: Is gravity a quantized field? Or, unlike most other fundamental phenomena in Nature, is gravity "emergent" and fundamentally classical?
Gravity on cosmic scales: Are the anomalous rotation curves of galaxies, the dynamics of galaxy clusters, and cosmic evolution overall really due to yet-to-be-discovered dark matter and dark energy, or is it perhaps our gravity theory that is incomplete?
The cosmological constant problem: The zero-point energy of vacuum fluctuations shall gravitate. Indeed, it has the same equation of state as dark energy. Could it be dark energy? But then, quantum field theory tells us that its energy density is either infinite or many dozens of orders of magnitude too big compared to the observed value.
The energy of the gravitational field: the gravitational field obviously carries energy (e.g., there is the gravitational potential energy that is released when two massive objects approach each other, or the energy carried by gravitational waves.) Yet general relativity tells us that in the immediate vicinity of an observer, spacetime is indistinguishable from empty spacetime, i.e., its local energy density must be zero. How can these two issues be convincingly reconciled?
Event horizon firewalls: In a quantum mechanical universe, can an observer ever reach the event horizon? Or would the observer be destroyed by a "firewall"? Does the event horizon even exist, given the finite lifetime of an evaporating black hole?
As these examples show, there is still plenty to do.​

 

[WhiteWalker]

How suddenly did man change from black to white in Europe? Was it a gradual change over time or did it happen with a few mutations?

An article in Scientific American quite a few years ago suggested that it took about 10,000 years for a population to become the “right” colour for the latitude at which it was living.

There is no need for any new mutations. There are a number of genes that control skin colour present in all human groups. All that is needed is for the proportions of those genes, or rather the alleles of those genes, in the population to change.​

 

[WhiteWalker]

If you open a microwave before the beep will it release deadly microwave radiation?

Yes, I did it once and my whole arm was soon covered with ugly radiation burns.

I’m kidding!

Microwave radiation just heats up water and oils, it’s not “radioactive” radiation. Nevertheless, thanks to the paranoid public response to the word “radiation”, manufacturers are careful to include an automatic shutoff switch that will stop the oven if the door is opened. I haven’t ever tried to defeat one, but I’ll bet it is very difficult.

See Radiation Hazards.

If you’re just desperate for things to worry about, I have lots of better suggestions.

 

[WhiteWalker]

Should it be considered a hate crime if a criminal specifically targets law enforcement officers as his victims?

In most jurisdictions, if someone attacks a police officer who is acting as an officer, there are already additional penalties. I support such additional penalties, because the police are risking their lives to protect us. I do not, however, see why there need to be further penalties on top of that.

I am, however, not a huge fan of hate crimes to begin with. I think we should simply provide appropriate penalties for violent acts in the first place.

There is some irony here. Many are against hate crime legislation. I am willing to bet that the people who have introduced this legislation have a problem with hate crime that provides additional penalties for protecting racial and other minorities. I am even less a fan of hypocrisy than I am of hate crime laws.

 

[WhiteWalker]

What is the coolest psychological trick?

Nodding your head up and down while asking a question substantially increases the likelihood that someone will answer affirmatively. When other people nod in response to something you say, you are likely to be perceived as an expert on the subject.

If your friend is giving a lecture and you want to produce contagious agreement in the room, vigorously nod your head at a rate of one bob per second, and you can independently alter the opinion of the entire audience.

 

[WhiteWalker]

What are the best ways to raise smart kids?

Take them to the library.

Show them how to check out books. Manage the cards; make it easy for them. Show them how to find books.

They'll pick up fiction and stumble across good literature.

They'll shuffle through non-fiction and naturally brush up related topics to the ones they're researching thanks to the Dewey Decimal system.

They'll read and read. They'll work on skills and learn history and gain a grasp of narratives and story telling.

They'll hunger for new topics and skills and worlds of interest.

They'll learn about philosophy and psychology magic and linguistics and code breaking and presentation skills and stocks.

They'll read about Shackleton and Turing and Lincoln and Phileas Fogg.

They'll develop taste in writing style and content. They'll grasp culture and better understand society and the world they inhabit.

A well stocked library is a candy store for an intelligent child. Best of all, it's free!

Take them to the library.

 

[WhiteWalker]

Does safely ejecting from a USB port actually do anything?

Why do we need safe removal at all?

Historically, Operating Systems treat disks as objects that can be trusted not to change state suddenly. When reading or writing files, the OS expects the files to remain accessible and not suddenly disappear in mid-read or mid-write. If a file is open, a program reading the file expects to be able to return to it and continue reading. Similarly, write commands may be dispatched to a writing subroutine and forgotten by the main program. If a drive disappears between the time the subroutine is called and the data is written to disk, that data is lost forever.

In ye olde days, there were formal processes to physically "mount" and "unmount" storage media, and the physical act of mounting a tape or a disk pack triggered some mechanical switch to detect the presence or absence of media. Once the mechanism was engaged, the software could start to use the media (a "soft mount."). Some media even had mechanical interlock to prevent media from being ejected or removed until the software processes using the media released the lock.

The Macintosh floppy and optical disk provide more modern examples of an interlocked physical and soft mount. One could only eject media through a software command, but that command might fail if some program was holding a file open on the medium.

Enter USB connected storage. There is no mechanical interlock in a USB connection to coordinate the hard and soft mount. The user can decide to rip the disk out from under the operating system at any time, and endure all manner of programs freaking out about the sudden loss of media. "Hey! I was using that!" Symptoms could include: Lost data, corrupted filesystems, crashing programs, or hanging computers requiring a reboot. A safe removal executes the "soft unmount" needed to prevent any unexpected Bad Things that may happen if a program loses its access to media.

A safe removal does a few things:

It flushes all active writes to disk.
It alerts all programs (that know how to be alerted) that the disk is going away, and to take appropriate action.
It alerts the user when programs have failed to take action, and still are holding files open.

You can remove a disk at any time, but you are at the mercy of how well programs using the disk cope with the sudden disappearance of that disk.

In the modern computer, many steps have been taken to defend against the capricious and careless removal of media. For example, Windows even introduced a feature called "Optimize for Quick Removal" makes sure data is written quickly instead of batched up and written efficiently.

It is very hard to get people to change habits. If you are doing exclusively reads on a media, safe removal is probably not needed. If you are doing writes, you are probably OK to skip safe removal if you haven't written recently and you aren't doing something silly like indexing that disk.

As a good friend of mine once said:
Life is too short to safely eject the disk.

However, Safe Removal does a number of important things and is, in fact, the only assuredly safe way to remove a disk. You probably don't need it most of the time, but it is a good habit to have since data loss sucks.

 

[WhiteWalker]

If I can scientifically prove that gayness is a psychiatric disorder, will I be awarded the Nobel Prize?

No. To start with, there is no Nobel Prize in psychology.

More importantly, it isn't clear how you could possibly prove what you are suggesting. Psychiatric disorders are characterized by behavior that is: 1) unusual in the sociological climate of the sufferer, and 2) detrimental to the sufferer or society. (There are other conditions as well, but these are the really relevant ones for this discussion.)

(1) is easy enough. But (2)? You would need to conclusively prove that being gay was somehow damaging.

Now, I suppose it is possible that all people who are homosexual are secretly serial killers who are so incredibly good at it that they are never caught, and you some how figure that out. But short of some utterly implausible scenarios, I think it is fair to say that what you are proposing is just not going to happen.

A slightly more realistic scenario is one in which you discover a way to change someone's sexual orientation. This would be a very impressive achievement, but if there are deaf people who choose to be deaf, you can be certain that there will be people who choose to remain gay (as, ignoring bigotry, being gay is much less of an inconvenience.)

 

[WhiteWalker]

I don't really get how the space between objects in the universe is increasing faster than the speed of light. Could you explain it in more detail?

Wait. Grab two laser pointers. Shoot two laser beams in two opposite directions. Measure how long it would take from the moment you press the button until the beams hit an object, say, 300 meters in each direction. (OK, such a measurement requires elaborate instrumentation, but it is eminently doable.) You’ll notice that the time required is 1 microsecond. But you shot the two beams in opposite directions, so now the two laser pulses are actually 600 meters apart. That is, the distance between them increased from 0 to 600 meters in one microsecond… it was increasing at twice the speed of light. How about that! You just made two things fly apart at twice the speed of light!

Of course I am cheating a little, because I am measuring the distance between the two things while I am not traveling with either of them. I am just standing in the middle. Relativity theory does not say that I cannot measure a speed between two things that’s greater than the speed of light. It only says that neither of those things can travel faster than the speed of light relative to me, the observer.

And when it comes to cosmic expansion, we are talking about things very far from here that, supposedly, do travel faster than light relative to me, the observer.

But here’s the clinch. I’m not really observing those things, do I. They are safely tucked away behind a cosmological event horizon. The only things I can actually observe are things that do move slower than the speed of light relative to me.

And this cosmological horizon exists, ultimately, because we live in curved spacetime. Sure, nothing can move faster than the speed of light at its location. And when you are co-located with a ray of light, its speed will always be (in a vacuum) 299,792,458 m/s. But when you look at a distant ray of light, its speed will be different, the same way the observed speed of light in a gravitational field will appear different to a distant observer. It has to do with relativistic time dilation, among other things.

At the cosmological horizon, time dilation becomes infinite. That is, if you could observe anything at the horizon, it would appear to have slowed down to a complete halt. (We cannot observe the horizon, but we can observe the cosmic microwave background. It is at a “redshift of about 1,100”, which means that if we were to observe any processes taking place at the location where the CMB originates, they would appear to have slowed down by a factor of 1,100. So if some space aliens had a laboratory there set up to measure the speed of light, and we watched it with some incredible telescope, we’d measure a speed of light of only about 270 km/s in that distant laboratory.)

Beyond the cosmic horizon… well, that part of the cosmos is not accessible to us because, you guessed it, it is moving away from us faster than the speed of light. Time dilation is now beyond infinite, which is kind of meaningless, but then again, since we cannot observe these things it doesn’t really matter.

As back in the distant past, cosmic expansion was still slowing down, these distant objects do slow down and eventually may come into sight. But when that happens, we get to see their entire history from the very beginning, or rather, from the moment they become visible… when they were still just hot, primordial gas, emitting what would become the cosmic microwave background.

So think about it. Any chunk of gas we observe with a radio telescope today, emitting that CMB, was, a few billion years prior, still moving faster than the speed of light relative to us and was not yet visible, hidden behind an event horizon of sorts. Eventually, it slowed down and became visible, and we are now seeing its history unfold from the beginning. For all we know, that chunk of gas at present is a mature galaxy, hosting numerous civilizations. But we are seeing it when it was still just primordial gas.

By the way, something similar also happens with black holes. An object that crosses the black hole event horizon is moving faster than light relative to us. But we don’t get to see it. In fact, the very event of it crossing the event horizon is forever in our future, unless we decide to fall into the black hole along with the object.

So yes, general relativity does allow all these things when spacetime is curved, and its rules remain self-consistent and always satisfied.

If all this is a little confusing, I am sorry. These things are really difficult to explain without the math, as the concepts themselves are highly mathematical and non-intuitive.

 

[DAM40]

Psychology was one of the first disciplines to study homosexuality as a discrete phenomenon. Prior to and throughout most of the 20th century, common standard psychology viewed homosexuality in terms of pathological models as a mental illness.​

 

[Kaveendra Randeera]

Suwoda eka dan wahalada ?

 

[ජොසී]

ලෝකෙ මෝඩයෝ ප්වැ‍රථිශතය වැඩි වෙලා බුද්ධිමතුන් ප්‍රථිශතය අඩු වෙන එකට තියන විසඳුම මොකක්ද?