Most of us have been using one online mapping program or another for years now. They’re a godsend for those of us who get lost within a 3-mile radius of our homes, and they’re just plain fun for people who enjoy figuring out where stuff is. With this in mind, imagine how amazing Google Earth must be for it to elicit awe from the online community and cause South Korea to demand changes to the program.
Google Earth is no ordinary mapping application. Type "Denver, CO" into the Google Earth search box, and yes, you can learn where Denver is in relation to Grand Junction and how to get from your address to 1600 Curtis St. in downtown Denver. In the same search, though, you can also learn that 1600 Curtis St. is in the 80202 zip code and that there are 12 Starbucks Coffee shops within a half-mile radius of that address; you can zoom out from 1600 Curtis St. and watch it disappear into a satellite view of the Earth and then zoom back in as if you were falling onto 1600 Curtis St. from space; and if you click on "Forbidden City" in the "Sightseeing" column, you can see what it would look like to fly Superman-style from 1600 Curtis St. in Denver to the Forbidden Palace in Beijing, China.
And you thought the world was small before.
The application is fairly easy to use, but there are a lot of functions to try out. So let’s see how you can get started with Google Earth.
我们很多人都用过在线地图程序一阵子了，对于那些在自己家周围３英里内迷路的人，后者以搜奇探秘的为乐的人来说，这可是个好东东。你要知道，Google Earth的威力是如此强大以致于韩国政府曾要求改变它（韩国曾抗议Google Earth的应用使本国安全受到了威胁）。
Google Earth神通广大，在地图类的应用中绝对是个狠角色。在Google Earth的搜索栏中输入“Denver, CO”，没错，你就能知道相对于Grand Junction的Denver的位置，还有怎么你的位置到Denver城区的Curtis街1600号。同样在这次搜索中， 你还能知道Curtis街1600号的邮政编码是80202，在此半英里的周围有12家星巴克咖啡馆。你可以缩小地图直到Curtis街1600号消失在卫星视图中，或者不断放大地图感受从天而降的感觉。如果这是在景点栏中输入“Forbidden City”，你会发现自己好像超人一样瞬间从Denver的Curtis街1600号飞到了中国北京的紫禁城。
Special thanks to Rain for her great advise
Sleep and the Brain
If you attach an electroencephalograph to a person’s head, you can record the person’s brainwave activity. An awake and relaxed person generates alpha waves, which are consistent oscillations at about 10 cycles per second. An alert person generates beta waves, which are about twice as fast.
During sleep, two slower patterns called theta waves and delta waves take over. Theta waves have oscillations in the range of 3.5 to 7 cycles per second, and delta waves have oscillations of less than 3.5 cycles per second. As a person falls asleep and sleep deepens, the brainwave patterns slow down. The slower the brainwave patterns, the deeper the sleep — a person deep in delta wave sleep is hardest to wake up.
At several points during the night, something unexpected happens — rapid eye movement (REM) sleep occurs. Most people experience three to five intervals of REM sleep per night, and brainwaves during this period speed up to awake levels. If you ever watch a person or a dog experiencing REM sleep, you will see their eyes flickering back and forth rapidly. In many dogs and some people, arms, legs and facial muscles will twitch during REM sleep. Periods of sleep other than REM sleep are know as NREM (non-REM) sleep.
REM sleep is when you dream. If you wake up a person during REM sleep, the person can vividly recall dreams. If you wake up a person during NREM sleep, generally the person will not be dreaming.
You must have both REM and NREM sleep to get a good night’s sleep. A normal person will spend about 25 percent of the night in REM sleep, and the rest in NREM. A REM session — a dream — lasts five to 30 minutes.
Medicine can hamper your ability to get a good night’s sleep. Many medicines, including most sleeping medicines, change the quality of sleep and the REM component of it.
在晚上的某些时刻，会发生一件出乎意料的事 — 快速眼部活动REM。大多数人都会在每天晚上进行3到5次REM，这时的脑部活动会加速到接近清醒的水平。如果你见过人或者狗进行REM睡眠的样子，你会发现他们的眼部迅速的前后转动，在很多狗和部分人类中，前臂、腿和面部肌肉还会发生抽动。不发生REM时候的睡眠也被称作非眼部快速活动睡眠NREM（没找到专业词汇，只按字面翻译）。
１. introduction to how sleep works
Sleep is one of those funny things about being a human being — you just have to do it. Have you ever wondered why? And what about the crazy dreams, like the one where a bad person is chasing you and you can’t run or yell. Does that make any sense?
Dreaming occurs in the fifth stage of sleep.
If you have ever wondered about why people have to sleep or what causes dreams, then read on. In this article, you’ll find out all about sleep and what it does for you.
Characteristics of Sleep
We all know how sleep looks — when we see someone sleeping, we recognize the following characteristics:
- If possible, the person will lie down to go to sleep.
- The person’s eyes are closed.
- The person doesn’t hear anything unless it is a loud noise.
- The person breathes in a slow, rhythmic pattern.
- The person’s muscles are completely relaxed. If sitting up, the person may fall out of his or her chair as sleep deepens.
- During sleep, the person occasionally rolls over or rearranges his or her body. This happens approximately once or twice an hour. This may be the body’s way of making sure that no part of the body or skin has its circulation cut off for too long a period of time.
In other words, a sleeping person is unconscious to most things happening in the environment. The biggest difference between someone who is asleep and someone who has fainted or gone into a coma is the fact that a sleeping person can be aroused if the stimulus is strong enough. If you shake the person, yell loudly or flash a bright light, a sleeping person will wake up.
For any animal living in the wild, it just doesn’t seem very smart to design in a mandatory eight-hour period of near-total unconsciousness every day. Yet that is exactly what evolution has done. So there must be a pretty good reason for it!
Reptiles, birds and mammals all sleep. That is, they become unconscious to their surroundings for periods of time. Some fish and amphibians reduce their awareness but do not ever become unconscious like the higher vertebrates do. Insects do not appear to sleep, although they may become inactive in daylight or darkness.
By studying brainwaves, it is known that reptiles do not dream. Birds dream a little. Mammals all dream during sleep.
Different animals sleep in different ways. Some animals, like humans, prefer to sleep in one long session. Other animals (dogs, for example) like to sleep in many short bursts. Some sleep at night, while others sleep during the day.
Cows can sleep while standing up, but they only dream if they lie down.
Whales and dolphins are "conscious breathers," and they need to keep breathing while they sleep, so only one half of the brain sleeps at a time. (Click here for details.)
Want more driving fun with real steering wheel and brake pedal? We can even learn how to drive with it!
There is only about one week left in March and I still stuck at the first section of my thesis. As a famous Chinese saying goes: It’s the most difficult to get start. To conclude, there may be two reason for the delay of my plan. first, as one of my senior fellow told me, a good thesis really deserve some inspiration and hardwork. Second, I have to admit that the anxiety of degeneracy of programming skill are constantly distract my attention on thesis writing. I know I shouldn’t so worry about that because where won’t be to much coding work but I just can’t help thinking of that. I don’t intend to be a bug searcher forever, anyway.
The recent reading of "design patterns explained" really help me a lot. The biggest difference is the book tell us why should we use a pattern, which always confuse me before. This is very important for the patterns learner who want to turn the UML diagrams on the books into real good design in their own practice.
Although I have to admit that I am not so good at it, but I decide to start translation column in this space. That means you will read some Chinese later on 😉 The decision has nothing to do with English practice, but the wiling of let you know something you probably don’t know, or partly know. Talking about information@ filtering, I can’t avoid the topic of the Great@ firewall. It’s so obvious that this stupid thing can not block anything from the people who really want to learn. The only function of it is to worse the reputation of our government. In the time with modern technology, Any wisdom managing power in this world should know that any attempt of cheating it’s citizen is useless and even dangours.