In the western world, text runs left-to-right. So when people are scanning a webpage, after they have read the content, it is natural to move your eyes or hand

In the western world, text runs left-to-right. So when people are scanning a webpage, after they have read the content, it is natural to move your eyes or hand to the right to get to the next piece text. This is analogous to reading a book, where you grab the right side of the page to turn the page.