Zivush - 6:01 pm on Dec 1, 2012 (gmt 0)
Having done a lot of medicine searches in my time, I know how hard it is to find all this information in one place, so the top level "collection" that Google offers is a real service to the end user.
I am a heavy user of this knowledge graph too lately.
Must say that at the beginning I took it with a bit of suspicious. Since I've start using it to collect quick data, it is a great service no matter how this service beats sites' traffic.