Twenty Eleven – Globally Remove Page Titles

Hello, can anyone tell me if their is some css code that I can input on to my site that will remove or hide the titles that display on each page.

When I create a page (and I guess post) on my static paged wordpress website, the page title displays in my navigation menu and also in the top of each page. I’d like to hide it if possible.

Any ideas?

Will hiding it affect my SEO results?

Thanks ??