On "Wet Bulb Temperature"

Before the holiday, we were working on a project that used the SHT series of sensors. This sensor has a function to calculate the dew point. But what is the dew point? Dew point, from the name, you can probably guess the meaning of this term - it’s related to the formation of dew. However, if you want to further explore the specific meaning of this professional term, you might think of searching for it on Baidu? Fang Jie posted an article a few days ago, which mentioned:

“Whether it’s Baidu or Google, the dew point is actually a banned word, poor dew point.”

You can try searching for this term on Baidu or Google yourself. So, why does this situation occur, and what can we do about it? Below, I’ll share my experience with everyone, and those who already know can skip it :)

Why does this situation occur?

Apparently, the ignorant search engine (although it’s not entirely its fault, see the specific reason later) misunderstood our intention. The dew point, apart from its scientific meaning, has another layer of meaning, which is often mixed with some results that make boys excited and happy :) . Therefore, to keep us far away from “yellow, gambling, and poison” and protect our young minds, our search results are blocked by something called GFW.

So, what is GFW?

GFW’s full name is the Great Firewall of China or the Chinese National Firewall, also known as the Great Wall of Fire. Because some forums also list GFW as a sensitive word that can excite boys, we usually use the term “Gong Fu Wang” (Kung Fu Net) to refer to it.

In general, the Great Firewall of China refers to the software and hardware system used by the Chinese government to monitor and filter internet content. The system consists of servers, routers, and related application programs. Due to China’s widespread internet censorship, websites with “inappropriate” content within China are subject to direct administrative intervention by the government, requiring self-censorship, self-regulation, and even closure. The primary function of the Great Firewall of China is to analyze and filter the exchange of information between China’s internal and external networks.

You can visit the Wikipedia entry zh.wikipedia.org/wiki/防火长城 for more information. Of course, if you click on the link directly, you’ll still “hit the wall” :) . So, how can we “climb over the wall”?

How to “climb over the wall”

There are many ways to climb over the wall, and I’ll introduce the simplest method below: Visit http://go2.appspot.com/. This website allows you to paste the URL you want to access into the box, such as the Wikipedia link above. After clicking “Go”, you’ll find that you can access the webpage :)

Then, try testing www.google.com with the keyword “dew point”. You’ll find that you can search for the result normally - this proves that Google is not stupid at all, and the developers’ IQ is probably similar to mine :) . The ignorance lies in China’s GFW.

Of course, you can also try searching for other keywords, but I won’t teach you how to search for bad things.

That’s it! We can finally climb over the wall and access the true internet - an internet without any restrictions. You’ll no longer see the annoying message “Some results are not displayed due to local policies or regulations”.

Extended knowledge:

HTTPS connection

You might have noticed that there’s a button called “Go (HTTPS)” on the wall-climbing website. If you click on this button, you can also climb over the wall. So, what is an HTTPS connection?

The internet protocol we use every day has poor security, and data is transmitted in plain text. For example, when you’re reading this article, the data transmitted from the server I rent to your computer is not encrypted. If someone or an organization (like the FBI, hopefully not) intercepts the data packet during transmission, they can know what you’re reading. This might not be a big deal for students like us, but I’m sure we don’t want our love letters to be stolen :) .

HTTPS connections can encrypt data transmission, making it difficult for others to intercept and decode (or at least, I think so - if you’re interested, you can research it yourself).

So, what’s the practical use of HTTPS connections?

Firstly, GFW will intercept all data packets, including your emails (related article: soildot). If they find that you’re discussing sensitive topics, you’ll be listed on the government’s most-wanted blacklist :) .

Therefore, to prevent being blocked again when climbing over the wall, it’s best to use the HTTPS button provided by the website.

Commonly used HTTPS connections:

https://www.quake0day.com/ - this is the HTTPS access channel for my overseas website ( advertisement)

https://mail.qq.com/ - this is the HTTPS login address for QQ Mail

GMail can be set to use HTTPS connections every time - it’s recommended to use GMail with HTTPS enabled when sending emails abroad, to prevent the recipient from not receiving the email.

That’s all for my tips - if you find them helpful, please leave a comment :) .

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