Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

This phrase is all over the internet. They will say that something is free as in 'free beer' and free as in 'free speech'. I have never really understood this. Are these the examples of two different types of 'free'?.
Wikipedia on Gratis versus Libre: Gratis versus libre is the distinction between two meanings of the English adjective 'free'; namely, 'for zero price' (gratis) and 'with few or no restrictions' (libre). The ambiguity of 'free' can cause issues where the distinction is important, as it often is in dealing with laws concerning the use of information, such as copyright and patents. And further: With the advent of the free software movement, license schemes were created to give developers more freedom in terms of code sharing, commonly called open source or free and open source software. As the English adjective free does not distinguish between 'for zero price' and 'liberty', the phrases 'free as in free beer' (gratis, freeware) and 'free as in free speech' (libre, free software) were adopted. [...] 'Free software is a matter of liberty, not price. To understand the concept, you should think of free as in free speech, not as in free beer.' Richard Stallman Emphasis added.

I am looking for the term describing when your hair grows kind of in a circular direction (defined by the direction of your hair root). Many people have something like this on the back of their heads or even on their foreheads. I found the term hair crown on dict.cc but I feel like this is either not the correct term for it or it is not very widely used. There is a German article on human hair including a section about these things but I could not find the English equivalent. In German, these are called Haarwirbel meaning something like hair whirl.
You probably want to use hair whorl. You'll notice that it's virtually the same as the German term, except with the alternate spelling of whorl/whirl. In English, whirl is the verb form, whorl is the noun.

Possible Duplicate: What is the correct way to pluralize an acronym? What's the plural form of 'SMS' (if X), like: I'm concerned, I sent him over a million X but got no response. I usually use text message to get rid of that situation.

The common way to pluralize acronyms is to add a lowercase S, so it would be SMSs. But SMS (short message service) is not usually used like that. SMS is the service you use to send text messages. SMS can also be used to talk about a feature-set ('It's got unlimited SMS.'), or a technology ('This tablet supports SMS.'). Both text (sometimes abbreviated txt) and text message are used. I'm concerned. I sent him over a million texts, but got no response. or I'm concerned. I sent him over a million text messages, but got no response. Google Ngram seems to support this: