Here I will write down some interesting websites which I crossed on the Internet and are worth mentioning.
http://www.sciencedaily.com/: Science Daily is a very big website showing you the latest research about several topics. For me the health and Mind & Brain section are the most relevant and interesting and sometimes I do some research here if I need some new topics to write about.
http://www.ehow.com : Ehow is one of the biggest websites on the Internet that gives you straight on information about what you need to know. Although some of their articles are a bit weird, a lot of them related to health give the solution to the problem you are looking for. The only negative thing is their information is kind of brief but this might just be what you want.