Maintain scroll position on previous page

This capability might already exist (if so, please tell me how to implement it) - but it's a basic UX problem that shouldn't happen --> when someone is scrolling my blog feed, then clicks into a post, and then wants to go back to resume scrolling in the feed, they should not be taken back to the top of the blog feed every time. They should be taken to exactly where they were when the clicked into the post. This is extremely frustrating, and a sure cause of abandonment.

So I'm wondering, (A) How can I do this if it exists, but (B) it should definitely be an option. I find myself getting frustrated when browsing my own blog, and it's my own blog. I can't imagine what my viewers think.

Thanks,

Gabe