Is there an in-setting explanation for how dragons breathe fire?

I’m currently in the process of writing a new campaign setting in which many classical mythical creatures have been rendered extinct for various reasons, one such creature is the dragon.
My initial idea was that some sort of event or evolutionary flaw in the past stopped dragons being able to breathe fire, making them far easier for adventurers and dragon hunters to kill off, similar to how the Dark Souls series made dragons extinct by removing their scales (the things which made them immortal), perhaps a plague removes the dragons’ ability to breathe fire, weakening them?

In an attempt to make this less jarring to players than just saying “they get ill, no breathe fire now”, I’d like to base the effect off of dragon lore that exists across the various editions of Dungeons and Dragons. Is there any in-setting lore explanation for why dragons breathe fire/acid/(insert damage type here)?

I know 5e is particularly sparse in dragon-lore, so I’m hoping some veterans from older editions might know more about these classical creatures!

Explanation needed with Django and AMP logic using 1 url

I’m using AMP at one of my parts of the website with Django template and python, my question is what will happen to a page (*SEO wise) if I take and break an AMPed page (only on desktop) and leave the page AMPed on mobile?!

To be more specific, I have made a full AMP page for both mobile and desktop which use the url (/example-amp-url) and now I need to add a widget to the page which is rendered with js and not AMPed at all but render it only on desktop.

Any one knows how it would impact on my SEO? Because for now in my site-map this page is AMPed both on mobile search and on desktop page (if Im losing the AMP on desktop it is fine but if I lose both its a huge problem thats why Im afraid to test it)

Is there some theoretical verification or explanation of why KDTree gets slower when the dimensionality gets higher?

This post and this post indicate that when the dimensionality gets higher, KDTree gets slower.

Per scikit-learn doc, the KDTree becomes inefficient as D(dimensions) grows very large (say, $ D>20$ ): this is one manifestation of the so-called “curse of dimensionality”.

Is there some theoretical verification or explanation of why KDTree gets slower when the dimensionality gets higher?

Here is Practical Explanation about Next Life, Purpose of Human Life,

Practical Explanation ( For Example ) :- `1st of all can you tell me every single seconds detail from that time when you born ?? ( i need every seconds detail ?? that what- what you have thought and done on every single second )

can you tell me every single detail of your `1 cheapest Minute Or your whole hour, day, week, month, year or your whole life ??

if you are not able to tell me about this life then what proof do you have that you didn’t forget your past ? and that you will not forget this present life in the future ?

that is Fact that Supreme Lord Krishna exists but we posses no such intelligence to understand him.
there is also next life. and i already proved you that no scientist, no politician, no so-called intelligent man in this world is able to understand this Truth. cuz they are imagining. and you cannot imagine what is god, who is god, what is after life etc.
for example :Your father existed before your birth. you cannot say that before your birth your father don,t exists.

So you have to ask from mother, “Who is my father?” And if she says, “This gentleman is your father,” then it is all right. It is easy.
Otherwise, if you makes research, “Who is my father?” go on searching for life; you’ll never find your father.

( now maybe…maybe you will say that i will search my father from D.N.A, or i will prove it by photo’s, or many other thing’s which i will get from my mother and prove it that who is my Real father.{ So you have to believe the authority. who is that authority ? she is your mother. you cannot claim of any photo’s, D.N.A or many other things without authority ( or ur mother ).

if you will show D.N.A, photo’s, and many other proofs from other women then your mother. then what is use of those proofs ??} )

same you have to follow real authority. “Whatever You have spoken, I accept it,” Then there is no difficulty. And You are accepted by Devala, Narada, Vyasa, and You are speaking Yourself, and later on, all the acaryas have accepted. Then I’ll follow.
I’ll have to follow great personalities. The same reason mother says, this gentleman is my father. That’s all. Finish business. Where is the necessity of making research? All authorities accept Krsna, the Supreme Personality of Godhead. You accept it; then your searching after God is finished.

Why should you waste your time?
all that is you need is to hear from authority ( same like mother ). and i heard this truth from authority ” Srila Prabhupada ” he is my spiritual master.
im not talking these all things from my own.

in this world no `1 can be Peace full. this is all along Fact.

cuz we all are suffering in this world 4 Problems which are Disease, Old age, Death, and Birth after Birth.

tell me are you really happy ?? you can,t be happy if you will ignore these 4 main problem. then still you will be Forced by Nature.

if you really want to be happy then follow these 6 Things which are No illicit s.ex, No g.ambling, No d.rugs ( No tea & coffee ), No meat-eating ( No onion & garlic’s )

5th thing is whatever you eat `1st offer it to Supreme Lord Krishna. ( if you know it what is Guru parama-para then offer them food not direct Supreme Lord Krishna )

and 6th ” Main Thing ” is you have to Chant ” hare krishna hare krishna krishna krishna hare hare hare rama hare rama rama rama hare hare “.
If your not able to follow these 4 things no illicit s.ex, no g.ambling, no d.rugs, no meat-eating then don,t worry but chanting of this holy name ( Hare Krishna Maha-Mantra ) is very-very and very important.

Chant ” hare krishna hare krishna krishna krishna hare hare hare rama hare rama rama rama hare hare ” and be happy.

if you still don,t believe on me then chant any other name for 5 Min’s and chant this holy name for 5 Min’s and you will see effect. i promise you it works And chanting at least 16 rounds ( each round of 108 beads ) of the Hare Krishna maha-mantra daily.
Here is no Question of Holy Books quotes, Personal Experiences, Faith or Belief. i accept that Sometimes Faith is also Blind. Here is already Practical explanation which already proved that every`1 else in this world is nothing more then Busy Foolish and totally idiot.
every `1 is already Blind in this world and if you will follow another Blind then you both will fall in hole. so try to follow that person who have Spiritual Eyes who can Guide you on Actual Right Path. ( my Authority & Guide is my Spiritual Master ” Srila Prabhupada ” )
if you want to see Actual Purpose of human life then see this link : ( triple w ( d . o . t ) asitis ( d . o . t ) c . o . m {Bookmark it })
read it complete. ( i promise only readers of this book that they { he/she } will get every single answer which they want to know about why im in this material world, who im, what will happen after this life, what is best thing which will make Human Life Perfect, and what is perfection of Human Life. ) purpose of human life is not to live like animal cuz every`1 at present time doing 4 thing which are sleeping, eating, s.ex & fear. purpose of human life is to become freed from Birth after birth, Old Age, Disease, and Death.

Solving recurrence relation with square root (need explanation)

Actually this question has been answered in this

But I am not able to understand in one place, and I could not comment over there. That’s why here I want to know the explanation.

$ T(n) = T(\sqrt n) + n$ to solve this recurrence relation, $ n = 2^m$ then it can rewritten as $ S(m) = S(m/2) + 2^m$ . This rewrite part I can’t understand.

Please explain.

Any explanation for why X fails every couple of weeks ? Ubuntu 18.10

I am running Ubuntu 18.10 on an i7-8 with 32Gb RAM and an NVIDIA RX-2080. We installed and x failed after a while. I had installed NVIDIA drivers. It seemed like the nouveau driver started running, no idea why. A couple of weeks later the resolution suddenly went to hell one morning, and the machine is barely responding.

Now it happened again. We blacklisted the nouveau driver, still didn’t work, re-installed NVIDIA. Now that the machine works again, can anyone explain why this happens, and whether blacklisting is likely to solve this problem? Is there anything else I can do?

Lorewise is there an explanation to improved spell capacity?

I have been glancing through the epic feats and i ran into a feat called Improved Spell Capacity which allows a caster to cast up to 25th level spells. As far as my lore knowledge goes after the events of Karsus’s Folly mortal wizards were banned from casting spells higher than ninth spell slot with epic spells working as a way to circumvent the ban by adding restrictions to a spell but this feat seems to eschew all of that. What i wish to ask is are there any lore reasons stated that explains why an epic wizard can cast spells of such magnitude?