Xinzhong Wei

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【果壳网专访】张益唐:数学让我更自在

一位籍籍无名的投稿者,一篇只有几位顶级数学家可能看懂的论文,一道200多年无解的数学难题,3年前,摆在世界数学顶级期刊《数学年刊》(Annals of …

Can China keep its giant economy on track?

China is walking an economic tightrope.<p>The dramatic fall in growth that some pessimists were predicting at the start of the year hasn't happened. But rising debt levels are cranking up the risks for the world's second largest economy.<p>On the surface, things look pretty stable. China's economy is …

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Americans blame Washington gridlock for slow economic growth: study

Americans blame political gridlock in Washington for the country's declining economic competitiveness and hold both Democrats and Republicans responsible, a Harvard Business School study released on Wednesday found.<p>The study noted that U.S. gross domestic product grew at a rate of about 2 percent …

Cancer breakthrough: Scientists develop 'smoke detector' test that can spot disease before symptoms are noticeable

A simple blood test that can detect cancer before any symptoms are noticeable has been developed by researchers in a breakthrough that could save …

Hear me now? 'Strong signal' from sun-like star sparks alien speculation

<b>(CNN) —</b> Astronomers engaged in the search for extraterrestrial intelligence (SETI) are training their instruments on a star around 94 light years from Earth after a very strong signal was detected by a Russian telescope.<p>An international team of researchers is now examining the radio signal and its …

Astronomy

小白(兔)学摄影:光圈

<b>光圈:</b>位于镜头内部的小叶片相互重叠构成的光孔,可根据其开闭程度调整图像感应器的进光量。光圈一般用f1.4、f1.8、f2.8、f3.5、f5.6、f22这些数字表示。光圈F值=镜头的焦距/镜头光圈的直径。其实光圈的工作原理跟人眼的瞳孔一样。在黑暗的地方,瞳孔会放大,这样进光量多才能看得清楚;而在明亮 …

Turn any hard drive into networked storage with Raspberry Pi

Networked hard drives are super convenient. You can access files no matter what computer you're on -- and even remotely.<p>But they're expensive. Unless you use the Raspberry Pi.<p>If you happen to have a few of hard drives laying around you can put them to good use with a Raspberry Pi by creating your …

美卫生署不再建议使用牙线?清洁牙齿,你还需要它

最近,根据一篇来自美联社( Associated …

揭开濒死体验的真相:大脑耍的一个花招而已

Oil producers are trying to protect themselves from another crash

A year later, a similar pattern could be playing out, or at least, that is what oil producers are fearing. After hitting a low point in February of this year, oil prices began a four-month rally, rising from $26 to $51 per barrel by June, the third year in a row in which the month of June saw a …

Computer Science

2017-18 General Catalog<p>Baskin School of Engineering<br>(831) 459-2158 <br>http://www.soe.ucsc.edu<p>Program Description<p>Computer science is the study of the …

Online Education

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她们为什么“死吃不胖”?你也能象她们一样吗?

你是否常常感到很不平衡?你拼命节食、拼命运动、尝试各种“减肥食谱”,而体重秤上的数字却无动于衷;而你的周围,却总是有人大吃大喝不运动,却依然窈窕纤细……之前火爆全网的日本“超级大胃王”木下优香,在炒面竞吃比赛中以3分多钟吃了将近八斤炒面、7分钟内吃完62个汉堡、5分钟内吃完3斤牛排、8分钟内吃完200个寿司……而她本人,却是一个身材娇小可爱的瘦姑娘。最近陌陌也搞了一个#谁是大胃王#的直播,获得第一名的妹子一小时吃了11个肉夹馍、6杯酸梅汤,而且说还没吃饱,最多的一次吃了20多个。但妹子看起来也挺瘦小,体重不过百。当然这只是表演,她在日常生活中是不是也每天吃许多食物,我们不得而知。不过在生活中, …

Brain damage test can predict if unconscious patients will ever wake up

Family members of brain damaged patients may no longer have to endure anxious waits to see if their loved ones will regain consciousness after scientists developed a test to predict who will wake up.<p>Yale researchers discovered that measuring how much glucose (sugar) the brain uses is a good …

数学中竟然还有这样的定理!

本文作者:matrix67<p>谁说数学是枯燥的?在数学里,有很多欢乐而又深刻的数学定理。这些充满生活气息的数学定理,不但深受数学家们的喜爱,在数学迷的圈子里也广为流传。<p>喝醉的小鸟<p><b>定理:喝醉的酒鬼总能找到回家的路,喝醉的小鸟则可能永远也回不了家。</b><p>假设有一条水平直线,从某个位置出发,每次有 50% 的概率向左走1米,有50%的概率向右走1米。按照这种方式无限地随机游走下去,最终能回到出发点的概率是多少?答案是100% 。在一维随机游走过程中,只要时间足够长,我们最终总能回到出发点。<p>现在考虑一个喝醉的酒鬼,他在街道上随机游走。假设整个城市的街道呈网格状分布,酒鬼每走到一个十字路口,都会概率均等地选择一条 …

The World's Largest Shipping Company Is Already Preparing For The Next Oil Crash

It was almost a year ago, when having tumbled in early 2015, oil proceeded to rebound strongly into the summer, where it traded at about $60 for …

野菜:再不开挖我们就老了!——一篇不规则的野菜采集食用指南

只有微波炉,也可以蒸烤炖炸!而且还不用刷锅!

完美的咸蛋是如何腌出来的

咸鸭蛋在中国无疑是最具号召力的“经典食品”之一。完美的咸鸭蛋,至少需要满足“流油”“红亮”“翻沙”三个特征。形成这三个特征的背后,蕴藏着怎样的科学奥秘呢?首先,为什么是“咸鸭蛋”而不是“咸鸡蛋”?从加工工艺的角度,用鸡蛋来腌咸蛋也毫无问题。人们之所以不亲睐咸鸡蛋,主要原因大概是:咸蛋的美味在于蛋黄,通常鸡蛋黄占整个蛋的比例不超过30%,而鸭蛋能接近35%——再加上鸭蛋的个头本来就比鸡蛋要大,咸鸭蛋也就更具吸引力。此外,鸭往往比鸡吃更多的虫子,因而鸭蛋也就有更重的腥味——要是象鸡蛋那样煮或者炒,风味就不如鸡蛋迷人。而制成咸蛋或者皮蛋,就可以去除腥味,也算是为鸭蛋找到了好的归宿。要说咸蛋背后的科学 …

US airlines are trying to close a loophole in ticket pricing, and it could cost you hundreds

NEW YORK (AP) — The three largest U.S. airlines have changed the way they price multi-city trips, forcing those who book such itineraries to pay hundreds of extra dollars in airfare.<p>Most fliers buy simple round-trip tickets and won't be affected. But travelers visiting several cities on one trip, …

New Alzheimer’s Treatment Fully Restores Memory Function

Of the mice that received the treatment, 75 percent got their memory function back.<p>Australian researchers have come up with a non-invasive ultrasound …

咬一口专属于春天的鲜美:野菜食用指南 | 果壳网移动版

春天来了,万物复苏,野菜们也长起来了!物资匮乏的年代人们不得不吃的野菜们,如今却显得越发珍贵起来。不仅成了菜市场的抢手货,甚至高档餐馆中也常见它们的身影。都有哪些野菜能吃?到底这些野味有什么好吃的?又怎么去吃呢?<p>好像突然之间就入春了,天气变得暖洋洋了起来。作为吃货,怎么能仅仅被日常生活中的菜色拴住我们的胃?当然要趁出门的时候尝尝时令的野菜来过瘾,趁机咬一口属于春天的鲜美。<p>春天的野菜不少,有些你肯定吃过!有些,你也许连名字都没听过,我们挨个来看吧~<p><b>常见的野菜</b><p><b>1.荠菜</b><p>十字花科植物,非常特别的春天味道。惯例是会有人问那三个终极问题的——不过连荠菜都要问能好怎的话,少年你是脱离现实世界太久了吧…众所周 …

【餐桌物种日历】3月5日 梨

【餐桌物种日历】3月6日 荠菜

Scientists Say They've Figured Out Why Exercise on Its Own Won't Make You Lose Weight

This is why diet is so important.<p>Anyone who's spent hours slaving away on the treadmill will know that more exercise doesn't always equal more weight …

Fitness

让刷牙不再纠结

More evidence of bias in how colleges use SAT scores

A little more than two years after the College Board released research rebutting findings concerning the board’s testing methods, a professor at …

College & University