设万维读者为首页 广告服务 技术服务 联系我们 关于万维
简体 繁体 手机版
分类广告
版主:
万维读者网 > 灵机一动 > 帖子
Reflection from a riddle
送交者: jingchen 2018年08月15日21:48:40 于 [灵机一动] 发送悄悄话

Reflection from a riddle. 

Ten humans are hijacked by aliens. The aliens try to decide whether humans are worth preserving. They give the humans a riddle. 

They ask ten persons to line up and put on either black hat or white hat. Each person can see the colors of the hats of those before him. But they cannot see the color of their own hat. 

The aliens give the humans five minutes to design a plan so at least nine out of ten persons can correctly determine the color of their hat. If they do, their lives will be spared. If not, they will be terminated.

Five minutes have passed. Have you figured out the answer? If yes, congratulations! 

Here is the answer. The person at the end of the line can see the colors of the hats of all nine other persons. If the number of white hats is odd, he is supposed to say white (or black, as agreed upon by everyone), otherwise, he would say black. The next person can count the number of white hats of the eight persons before him and deduce what color his own hat is. Each person can determine the color of his hat in this way.

In this riddle, there is no global design. People are not instructed to perform specific tasks beforehand. Rather, each person makes decision based on the action of the previous person. In other words, there is a cascading of actions.

We often wonder how our bodies can build such complex systems based on relative few genes. My guess is that there are a lot of cascading going on inside our bodies. Very often, the immediate environment can generate certain chemical reactions spontaneously without genetic instructions. I don’t know specific examples. Will learn in the future.


0%(0)
0%(0)
标 题 (必选项):
内 容 (选填项):
实用资讯
发龙药业大回馈!美国专利骨胶原、活心素、灯盏素、排毒养颜宝购买两疗程免费邮寄中国
天天养生,保健礼品,物超所值,疯狂现金折扣,直销美加,港台,大陆,东南亚
最劲爆,最给力美国专利产品<骨精华>消除关节痛、骨质疏松<心血通>预防心肌梗塞
免开通费,30天免费试用中文电视万花筒, 无捆绑服务,月费5.99
西洋参、羊胎盘、鱼油卵磷脂200多种送礼自用健康佳品,全部特价!由此进入
留美学生医疗保险$39/月,短期访美旅游保险,不需体检无年龄限制
一周点击热帖 更多>>
一周回复热帖
历史上的今天:回复热帖
2016: 我们总觉得科里奥利力很小,一般察觉不
2016: 高考物理附加题:坐地日行八万里
2013: 民间谜语故事