I created a separate page for my blog, but it can't find it

I have a self-hosted site with a static front page and a separate page for my blog (which is titled “Science”), but when I click its link in the navigation bar, I get an error message that says “Nothing Found”.

I thought maybe that would go away when the writer started posting things in the blog, but he got the same error. He’s able to post from the dashboard, and it shows up when he uses the search function to find it, but when he clicks the search result, he gets the error again.

It’s been so long since I set this up, I don’t remember where in the dashboard I set up the Science page to be the blog. I thought I’d check there to see if that might be where the problem is, but I really don’t know.

Anyone have any ideas what the problem might be?
Thanks very much.