Some scientists assert it's highly unlikely that it doesn't exist because of the enormous number of unexplored planets, solar systems, and galaxies.
I find that hard to buy. First of all, it seems to me that the accidental development of a livable Earth was an extremely unlikely, near-impossible occurrence. Throw in the extremely unlikely, near-impossible occurrence of the development of humans (see
below) and I think what we see here is the most remote of 'black swan' events.
If there is life at all on other planets it's most likely something not even close to being human and, even if highly evolved, could be something like the dinosaur age.
Then there is always the fundamental question of whether it's smart to contact more advanced beings that may covet our water-covered planet and would consider it desirable to possess .. minus the icky humans.
'What the human genome is lacking compared with the genomes of other primates might have been as crucial to the development of humankind as what has been added during our evolutionary history, according to a new study led by researchers at Yale and the
Broad Institute of MIT and Harvard.
The new findings, published April 28 in the journal Science, fill an important gap in what is known about historical changes to the human genome. While a revolution in the capacity to collect data from genomes of different species has allowed scientists
to identify additions that are specific to the human genome -- such as a gene that was critical for humans to develop the ability to speak -- less attention has been paid to what's missing in the human genome.
For the new study researchers used an even deeper genomic dive into primate DNA to show that the loss of about 10,000 bits of genetic information -- most as small as a few base pairs of DNA -- over the course of our evolutionary history differentiate
humans from chimpanzees, our closest primate relative. Some of those "deleted" pieces of genetic information are closely related to genes involved in neuronal and cognitive functions, including one associated with the formation of cells in the developing
brain.
These 10,000 missing pieces of DNA -- which are present in the genomes of other mammals -- are common to all humans, the Yale team found.
The fact that these genetic deletions became conserved in all humans, the authors say, attests to their evolutionary importance, suggesting that they conferred some biological advantage.
"Often we think new biological functions must require new pieces of DNA, but this work shows us that deleting genetic code can result in profound consequences for traits make us unique as a species," said Steven Reilly, an assistant professor of genetics
at Yale School of Medicine and senior author of the paper.'
https://www.sciencedaily.com/releases/2023/04/230427173438.htm
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