I cannot create an article summary for "Man in the middle" from Science, volume 391, number 6780, because the content of this article is not available in the search results provided. The search result [4] contains only the title and information that the article is on the front page of an issue with a photo of bison in Yellowstone, but the text of the article itself is not available. Without access to the full content of the article, I cannot comply with your request for a factual and verified summary.