AI videos have killed off the idea that aliens can visit planet Earth

One benefit of AI - at least until we tire of it - is that there are now a high percentage of videos on YouTube that have been created by artificial intelligence. These videos are everywhere the YouTube website.

And prominent for me are those videos which present the science and thoughts of Richard Feynman. The man was brilliant but these videos are voiced by AI and the script is not written by Feynman but an anonymous - I presume - scientist or scientists. There are copycat versions all over the website too.

The videos explain conclusively and logically using the science of space/time, the speed of light and the vast distances of the universe that aliens cannot get to Earth and we can't get to see them on their planet either - if they exist. We just don't know.

People think there must be alien life out there because there are billions upon billions of opportunities for intelligent life to evolve. But the evolution of the human is astonishing and it is argued extremely rare - it took 3.5 billion years (3500000000)! Perhaps so rare that there is no other version of us or like us anywhere in our galaxy.

But there are 2-3 trillion galaxies! The point is that the science tells us that it is physically impossible or near impossible for aliens from a far off planet to visit planet Earth.

In effect humans on planet Earth are entirely alone in the black void of the silent universe. And we will remain that way for eternity or as long as the species we know as homo sapiens exists (probably a relative short time such as 10,000 more years due to the self-destructive nature of humans).

Here is one of probably hundreds of videos on this topic. I sense that many people are trying to jump on the Feynman bandwagon and creating their own versions of the same physics.

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P.S. please forgive the occasional typo. These articles are written at breakneck speed using Dragon Dictate. I have to prepare them in around 20 mins. Also, sources for news articles are carefully selected but the news is often not independently verified. And, I rely on scientific studies but they are not 100% reliable. Finally, (!) I often express an OPINION on the news. Please share yours in a comment.

Reason why Ragdoll cats have blue eyes

Ben in his video below explains why Ragdoll cats have blue eyes for the standpoint of physics. But it isn't just Ragdoll cats which have blue eyes. Kittens have too and Siamese must have blue eyes and other breeds are allowed to have blue eyes under their breed standards. 

The physics behind the blue eyes of cats including the Ragdoll. Screenshot.

The Ragdoll breed standard states that Ragdolls must have blue eyes. EYES: large, vivid blue ovals. Wide set and moderately slanted, complementing wedge.

And the anatomical reason and the physics behind the blue colour of their eyes is explained in the video below. The same reason applies to kittens when their eye colour is developing but not yet developed.

Blue eyes caused by scattering of blue light not pigment. Image: MikeB

And the same physics applies to the blue sky. The color blue has a shorter wavelength than the other colours and it is scattered more by the particles in the air which is why the sky is blue.

RELATED: Why are kittens’ eyes blue?

It is this scattering of blue light and not the other colours which accounts for blue eyes in Ragdoll cats.

Why do cats have wet noses?

The first question to ask is whether domestic cats have wet noses normally. Under normal circumstances, by which I mean nothing strange climatically, domestic cats do not have wet noses. Their noses are quite dry and I can rely on personal experience - years of it. So a domestic cat's nose is dry and we are referring to the nose leather as cat lovers call it. This is the tip of the nose.

Image by I. Aa van der from Pixabay 

If the nose leather is wet it is probably due to one of two reasons. Firstly: condensation - if a cat is outside in cold weather their warm breath exiting through the nostrils of the nose condenses on the nose leather and when it does so the breath turns into liquid which makes the nose leather wet. Humans encounter this all the time when, for example, going for a walk in winter. 

The second reason would be that the cat has a cold or to put it more technically an upper respiratory infection (URI) which causes a nasal discharge, some of which ends is up on the nose leather.

Ah..there is a third possibility. A cat has licked his nose due to displacement activity! That happens quite a lot. When cats are unsure they temporarily remove the uncomfortableness of that feeling by displacing it with a nose lick.

That, as far as I can see, is the full answer. It appears to me that some people think that a nose should be wet because the question is pitched in a way which presupposes that the nose is wet. This is not true in my opinion. It's a misconception. If it is wet a lot for some cat owners then it is because of condensation as mentioned above. It may be because their home is quite cold.

If the home is cold a cat's nose leather will be cold. So when the hot air of the breath meets the cold nose leather the water vapour in the breath condenses into a liquid on that surface. It's just a question of physics. We see condensation all over the place. It happens most normally or likely on windows inside the home or the car.

If there are, say, four people inside a car and it is winter, the breath of these people may condense on the cold windows of the car. It's exactly the same physics. That's enough I think! No, here is some physics.

What is condensation and how does it work? Condensation is the opposite to evaporation, which is when a liquid water becomes a vapour. In condensation water vapour becomes a liquid. When water vapour condenses on a surface it is because the air is cooled to its dew point. The dew point is the temperature at which condensation happens. The dew that we see on the grass in the morning is water that has condensed out of the atmosphere. The dew point varies based on the saturation levels of the water in the atmosphere and the air temperature known as relative humidity.