・・・The similarities between humans and chimps are well known, but one important difference has to do with group size. Chimpanzees, on average, can maintain a group size of about 45, says Dunbar. “This appears to be the largest group size that can be maintained through grooming alone,” he says. In contrast, the average human group is about 150, known as Dunbar’s Number. The reason for this, says Dunbar, is that humans have the capacity to reach three times as many social contacts as chimps for a given amount of social effort. Human religion emerges out of this increased capacity for sociality.・・・
・・・supernovae?cataclysmic explosions of dying stars-showered the Earth with cosmic rays between around 8 million and 2.6 million years ago.
When this space radiation entered the lower atmosphere, it triggered a process known as ionization which may have produced a huge increase in cloud-to-ground lightning strikes. This in turn could have led to an uptick in forest fires around the world.
The authors of the study suggest that these fires could have been one factor in the development of bipedalism?a characteristic that may have allowed our ancestors to better adapt to the savannas that replaced the burnt forests of northeast Africa.・・・ https://www.newsweek.com/ancient-supernovae-wildfires-human-ancestors-upright-14374240195世界@名無史さん2019/05/30(木) 12:06:01.610 超新星爆発 ↓ ガンマ線直撃 ↓ 雲の増加 ↓ 寒冷化・氷河期 ↓ 大量絶滅
この本買って読み始めたのだが、冗長な文章にとにかくいらいらする 0198世界@名無史さん2019/07/11(木) 21:33:18.190 今回、ギリシャで発見された頭蓋骨片は、 「アフリカ以外で最古の人間の化石である」 ・・・ その主張が立証され、多くの科学者がさらに証拠を求めているとすれば、この発見は 人類の歴史の重要な章を書き換え、その頭蓋骨はヨーロッパで最古だと知られている ものよりも16万年以上も前のホモ・サピエンスの化石になるだろう。 Piece of skull found in Greece ‘is oldest human fossil outside Africa’・・・ If the claim is verified - and many scientists want more proof - the finding will rewrite a key chapter of the human story, with the skull becoming the oldest known Homo sapiens fossil in Europe by more than 160,000 years.・・・ https://www.theguardian.com/science/2019/jul/10/piece-of-skull-found-in-greece-is-oldest-human-fossil-outside-africa
ホントかどうか、それが問題だ。 0199世界@名無史さん2019/07/12(金) 02:15:56.090>>195 ガンマ線バーストが直撃すれば陸上の生命は全滅だぞ 0200世界@名無史さん2019/07/12(金) 02:19:25.760>>198 可能性は2つ 現世人類の出アフリカが予想よりずっと早かった 現世人類の化石では無く別の旧人の化石 0201世界@名無史さん2019/07/12(金) 21:51:43.380 >mere inches from another skull > The second skull, which retains a face, was studied the most and identified as Neanderthal.