巴瑶族海上游牧民族进化出了更大的脾脏
由于世世代代的潜水生活，他们的脾脏比对照群体大50%，这是遗传性的不是训练结果，他们的进化基因变异提高了甲状腺激素水平，使得脾脏更大，增加血红蛋白、血细胞比容和红细胞计数，潜水能力增强
此外，所有哺乳动物都具有潜水反射，能显著增加可用氧气。当面部接触冷水并屏住呼吸时，心率减慢、血管收缩、脾脏收缩释放红细胞，氧气提升约10%
BY 你不知道的冷知识
Tata Power whose core business is to generate, transmit and distribute electricity has made no money to investors in the last one decade. That is a big blunder considering it is one of the largest power generation companies in the country. One of the reasons is the company's huge debt levels which stood at ₹43,559 crore at the end of March 2021 compared to the company’s market capitalisation of ₹44,447 crore.
The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.
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