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密码1:头跟笔记本电脑一样重一个人的头到底有多重?答案是跟一台笔记本电脑差不多,大约1.4公斤(不包括头骨重量)。人的大脑包括80%的水,其中25%被用做有氧及糖分的体内循环,以补给营养。人发育到18岁时,脑袋就不会再长了。密码2:血管长度可绕地球两周人体布满了密密麻麻的血管,说出来也许你不相信,人体大大小小血管有1000多亿条,如果将人体的所有血管接成一条线,科学家估计,成人的血管总长度约为96000公里。地球一周是40000公里,也就是说,人体血管的长度可以绕行地球2周半。
Password 1: Heads Like a Laptop How heavy is a person’s head? The answer is about the same as a laptop, about 1.4kg (excluding skull weight). The human brain consists of 80% of the water, of which 25% is used as an internal circulation of aerobic and sugar to supplement nutrition. People grow to 18 years old, the brain will not be longer. Password 2: The length of the blood vessels around the Earth can be covered with dense two weeks of blood vessels, say maybe you do not believe that there are more than 100 billion human blood vessels, if all the human blood vessels connected in a line, scientists estimate, The total length of adult blood vessels is about 96,000 km. Earth is 40,000 kilometers a week, that is, the length of human blood vessels can bypass the Earth for 2 weeks and a half.