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"why choose robots?" and "why choose robots ?"
In the first example the question mark is joined to robots. Would this make it less likely to rank well for a search of "who choose robots" than the second example?
Minor differences in punctuation won't make any difference to your search engine performance. However, you're well advised to use the same grammatical rules as your target audience, as your language is then much more likely to "connect" with them, and result in a better experience while using your website.
Is "eye glasses" seen differently that "eyeglasses"?
If you run the searches on Google and take a look at the results, you'll see that there obviously is a difference. You'll also see that the top ranking sites target both. Chances are that misspellings in inbound links also keep the high ranking sites up there for both.
Google does make stemming connections, and it's likely it also makes connections among spelling and punctuation variants.
What's not clear is how much Google rewards the approximations. In general, it appears that Google attaches more weight to spellings or punctuation that exactly match the query.
[edited by: Robert_Charlton at 7:52 pm (utc) on Jan. 10, 2009]
[edited by: engine at 10:11 am (utc) on Jan. 11, 2009]
[edit reason] See TOS [/edit]