Thank you for using Yahoo Pipes! To help focus our efforts on core Yahoo product experiences, users will no longer be able to create new Pipes starting August 30th 2015. The service will be put in read-only mode until we will discontinue Yahoo Pipes on September 30th 2015. You can find more details here.
a demonstration of how to combine news feeds from:
1) Google News, 2) Yahoo! News, 3) Wikinews, and 4) The NYTimes national news feeds -- filtered on a search term.
The pipe filters for repeated items based on the link of the item.