bottleneck events...

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   https://www.youtube.com/watch?v=NoFQjAHsWE8 or https://www.youtube.com/watch?v=NoFQjAHsWE8 ;The Forgotten Prehistoric War That Killed 19 Out Of 20 Men
7,000 years ago something happened that was so severe that it permanently left a scar within our DNA...

see also https://en.wikipedia.org/wiki/Population_bottleneck  or https://en.wikipedia.org/wiki/Population_bottleneck ;
A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling. Such events can reduce the variation in the gene pool of a population; thereafter, a smaller population, with a smaller genetic diversity, remains to pass on genes to future generations of offspring. Genetic diversity remains lower, increasing only when gene flow from another population occurs or very slowly increasing with time as random mutations occur.^[1]^{[self-published source]} 

This results in a reduction in the robustness of the population and in its ability to adapt to and survive selecting environmental changes, such as climate change or a shift in available resources.^[2] Alternatively, if survivors of the bottleneck are the individuals with the greatest genetic fitness, the frequency of the fitter genes within the gene pool is increased, while the pool itself is reduced.

And https://en.wikipedia.org/wiki/Paraguayan_War#Casualties_of_the_war or https://en.wikipedia.org/wiki/Paraguayan_War#Casualties_of_the_war ;

Paraguay suffered massive casualties, and the war's disruption and disease also cost civilian lives. Some historians estimate that the nation lost the majority of its population. The specific numbers are hotly disputed and range widely. A survey of 14 estimates of Paraguay's pre-war population varied between 300,000 and 1,337,000.^[94] Later academic work based on demographics produced a wide range of estimates, from a possible low of 21,000 (7% of population) (Reber, 1988) to as high as 69% of the total prewar population (Whigham, Potthast, 1999). Because of the local situation, all casualty figures are a very rough estimate; accurate casualty numbers may never be determined.
After the war, an 1871 census recorded 221,079 inhabitants, of which 106,254 were women, 28,746 were men, and 86,079 were children (with no indication of sex or upper age limit).^[95]
The worst reports are that up to 90% of the male population was killed, though this figure is without support.^[91] One estimate places total Paraguayan losses—through both war and disease—as high as 1.2 million people, or 90% of its pre-war population,^[96] but modern scholarship has shown that this number depends on a population census of 1857 that was a government invention.^[97] A different estimate places Paraguayan deaths at approximately 300,000 people out of 500,000 to 525,000 pre-war inhabitants.^[98] During the war, many men and boys fled to the countryside and forests.

DJ, Lots of times humans almost ended...

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Dutch Josh 2 Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 21 Aug 2024 Status: Offline Points: 1400	Post Options Post Reply Quote Dutch Josh 2 Report Post Thanks(0) Quote Reply Topic: bottleneck events... Posted: 16 Feb 2025 at 11:18pm
	https://www.youtube.com/watch?v=NoFQjAHsWE8 or https://www.youtube.com/watch?v=NoFQjAHsWE8 ; The Forgotten Prehistoric War That Killed 19 Out Of 20 Men 7,000 years ago something happened that was so severe that it permanently left a scar within our DNA... see also https://en.wikipedia.org/wiki/Population_bottleneck or https://en.wikipedia.org/wiki/Population_bottleneck ; A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling. Such events can reduce the variation in the gene pool of a population; thereafter, a smaller population, with a smaller genetic diversity, remains to pass on genes to future generations of offspring. Genetic diversity remains lower, increasing only when gene flow from another population occurs or very slowly increasing with time as random mutations occur.^[1]^{[self-published source]} This results in a reduction in the robustness of the population and in its ability to adapt to and survive selecting environmental changes, such as climate change or a shift in available resources.^[2] Alternatively, if survivors of the bottleneck are the individuals with the greatest genetic fitness, the frequency of the fitter genes within the gene pool is increased, while the pool itself is reduced. And https://en.wikipedia.org/wiki/Paraguayan_War#Casualties_of_the_war or https://en.wikipedia.org/wiki/Paraguayan_War#Casualties_of_the_war ; Paraguay suffered massive casualties, and the war's disruption and disease also cost civilian lives. Some historians estimate that the nation lost the majority of its population. The specific numbers are hotly disputed and range widely. A survey of 14 estimates of Paraguay's pre-war population varied between 300,000 and 1,337,000.^[94] Later academic work based on demographics produced a wide range of estimates, from a possible low of 21,000 (7% of population) (Reber, 1988) to as high as 69% of the total prewar population (Whigham, Potthast, 1999). Because of the local situation, all casualty figures are a very rough estimate; accurate casualty numbers may never be determined. After the war, an 1871 census recorded 221,079 inhabitants, of which 106,254 were women, 28,746 were men, and 86,079 were children (with no indication of sex or upper age limit).^[95] The worst reports are that up to 90% of the male population was killed, though this figure is without support.^[91] One estimate places total Paraguayan losses—through both war and disease—as high as 1.2 million people, or 90% of its pre-war population,^[96] but modern scholarship has shown that this number depends on a population census of 1857 that was a government invention.^[97] A different estimate places Paraguayan deaths at approximately 300,000 people out of 500,000 to 525,000 pre-war inhabitants.^[98] During the war, many men and boys fled to the countryside and forests. DJ, Lots of times humans almost ended...