現在の生物学の教科書では、大規模な個体群を持つ生物種は時間が経過するほど遺伝的 多様性が増し、進化してきたというのが定説だが、大規模遺伝子調査により、人間を含む現在 地球上に存在する生命種の10種のうち9種が、10万〜20万年前に出現した事が明らかになった。 ・・・It is textbook biology, for example, that species with large, far-flung populations -think ants, rats, humans-will become more genetically diverse over time. But is that true? "The answer is no," said Stoeckle, lead author of the study, published in the journal Human Evolution. For the planet's 7.6 billion people, 500 million house sparrows, or 100,000 sandpipers, genetic diversity "is about the same," he told AFP. The study's most startling result, perhaps, is that nine out of 10 species on Earth today, including humans, came into being 100,000 to 200,000 years ago. "This conclusion is very surprising, and I fought against it as hard as I could," Thaler told AFP. That reaction is understandable: How does one explain the fact that 90 percent of animal life, genetically speaking, is roughly the same age?・・・ https://phys.org/news/2018-05-gene-survey-reveals-facets-evolution.html
Scientists Discover New ‘Micro-organ’ Hiding in Our Immune System・・・ Researchers from Australia’s Garvan Institute of Medical Research identified a structure that “remembers” past infections and vaccinations—and is filled with immune cells of many kinds which respond to pathogens that the body has encountered before.・・・ https://www.newsweek.com/scientists-discover-new-micro-organ-hiding-our-immune-system-1086757