Ask HN: Feedback on my Idea?

So, I am planning to build this tool for some days now but not sure whether similar app already exists or not.. Even if there isn't, I doubt if there is audience for this concept..

Concept is : News Topic search:

A simple search box where you'll enter a news topic and it provides a timeline of incidents related to the topic.. It'll basically comes up with the news articles that surfaced and articles that are once trending and conclusion articles and more.. Search terms like "Malaysia flight MH370" "Ebola Breakout"

What do you thing of it? worth pursuing?