Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

Monday, August 3, 2020

Why Neanderthals go extinct.?

Neanderthals are our closest extinct human relatives. 
They lived in Eurasia about 200,000 to 30,000 years ago. Their appearance was similar to ours though they were shorter and stockier with angled cheekbones prominent brow ridges and wide noses they were perfectly evolved to survive the eternal winter of the Ice Age.
Initial discoveries of Neanderthals made them out to be savage cannibals but new evidence has been unearthed that has spiffed up the image of the Neanderthal people.








Like us they made tools, wore clothes, controlled fire, cared for their sick and buried their dead they also possess the same variant as us of the Fox p2 gene essential for language so they probably spoke, perhaps they even painted engraved on the walls of caves. So if the Neanderthals were such an intelligent well adapted species, then the Question is...
 
why did they go extinct?

A popular theory is that humans wiped them out. we had much more advanced tools and social systems. Humans also domesticated wolves which made them far superior hunters. 
Humans dominance for scarce resources at the end of the Ice Age could have pushed Neanderthals to extinction, perhaps it was a natural disaster that killed off the Neanderthals or climate change or a disease, Another emerging theory is that the Neanderthals never actually went extinct but instead inbreed with the larger human population.
There was roughly a 5,000 year period where both Neanderthals and humans lived in Eurasia together during this period there was in breeding between the two species the proof is in our DNA, In fact about 1.5 to 2.6 percent of the DNA of anyone outside Africa is of Neanderthal origin. Researchers think that 20% of the neanderthal genome is still found within humans so they never exactly went extinct instead their DNA just became part of the modern human genome.
 
So now that we know we have Neanderthal DNA coursing through our veins what exactly can we do with this information. Well it turns out that these Neanderthal can affect your personality. Psychologists have found that individuals with the higher level of the neanderthal genome have an aversion to strangers and are more prone to nervousness and anxiety. 
So basically the more Neanderthal you are the less social you are. This makes perfect sense since Neanderthals were much less social than humans. So the next time you're feeling antisocial at a party ask yourself is this a lame party or am I just being a Neanderthal. 

Sunday, June 28, 2020

Artificial heart

Artificial hearts sound like science fiction or like a Sci fi movie, but they’ve actually been in clinical use to help end-stage heart failure(when heart is unable to pump sufficient blood) patients for more than 35 years. 

As the number of patients suffering from heart disease has increased over the years, so too has the need for heart transplants. Unfortunately, the global supply of donor hearts remains limited, and not everyone who needs a heart transplant will receive a matching donor heart in time.

Recognizing the need for an effective and immediately available alternative to a donor heart, surgeons, medical researchers and inventors began developing early versions of total artificial hearts during the first half of the 20th century.

There have been 13 artificial heart designs used in patients, but only one has received commercial approval from the FDA.

Since the first patient implant in 1969, medical teams across the globe have developed 13 different artificial heart designs that have been used in patients. Many of these designs were initially intended to be permanent solutions. However, the majority have been used as temporary measures to keep a patient alive until a matching donor heart becomes available, known as a bridge to transplant, that's the importance an artificial heart has. 

As per the survey, a patient survived a maximum of 4.5 years on artificial heart. 




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