Interestingly, this is still a style choice. Just a few more to consider: * webpage vs web page * website vs web site * lifestyle vs life style * Asian-Ame

Interestingly, this is still a style choice. Just a few more to consider: * webpage vs web page * website vs web site * lifestyle vs life style * Asian-American vs Asian American * e-commerce vs ecommerce * cannot vs can not * real-time vs real time (as one of the comments in this thread). http://www.quickanddirtytips.com/education/grammar/e-mail-or-email http://www.quickanddirtytips.com/education/grammar/e-mail-or... http://www.reuters.com/article/2007/09/21/us-britain-hyphen-idUSHAR15384620070921 http://www.reuters.com/article/2007/09/21/us-britain-hyphen-... http://www.glendalenewspress.com/news/tn-gnp-aword-20100901,0,121602.story http://www.glendalenewspress.com/news/tn-gnp-aword-20100901,... My English teacher tells us that we change grammar as we progress as a society. Articles from the 1700s will be different from the one from 1800s, 1900s and 2000s. Also, writing style and grammar are also regional and industry dependent. Some note from Oxford dictionary (http://blog.oxforddictionaries.com/2011/10/hyphens-in-the-headlines/ http://blog.oxforddictionaries.com/2011/10/hyphens-in-the-he...) > Let’s just step back from the hyperbole: how do dictionary-makers decide whether noun compounds should be hyphenated or not? It’s not an arbitrary choice: for our current English dictionaries, such as the free one on this website, Oxford’s lexicographers assiduously check the evidence of billions of words of today’s English on a huge database, the Oxford English Corpus. If they see that in the vast majority of cases, a noun such as ice cream is written as an unhyphenated two-word form, then this is the spelling they will select to appear in the dictionary.