Original headline is "Yahoo! (YHOO), Google Enter Services Agreement"; current HN headline is "Yahoo to show Google ads in Search" which seems to be an odd focus, since the actual agreement, per the article, has three components, as "Google will provide [...]":
1) "Yahoo with search advertisements through Google’s AdSense for Search service" (this is the part the headline covers)
2) "web algorithmic search services through Google’s Websearch Service, and"
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[ 2.7 ms ] story [ 10.3 ms ] thread1) "Yahoo with search advertisements through Google’s AdSense for Search service" (this is the part the headline covers)
2) "web algorithmic search services through Google’s Websearch Service, and"
3) "image search services".