If you want to know about dinosaurs, geology, radiometric dating, the solar system, plate tectonics, or pretty much any other natural science, Conservapedia is your Number One resource to get the wrong answer.
That it is intended specifically as a science resource for homeschooled children, who don't have the benefit of an accredited science teacher, is its main reason for making this list.
Sites that make this list are only here because of the quality of the science information that they advocate.
As a measure of each site's popularity, I'm giving its ranking on as of this writing.
Science journalists have repeatedly taken Huff Po to task for this, and repeatedly been rebuffed or not allowed to submit fact-based rebuttals.
Huff Po's anti-science stance on health and medicine appears to be deliberately systematic and is unquestionably pervasive.
For a starting point of reference, Skeptoid.com's ranking is currently about 40,000, meaning that 40,000 websites in the United States get more traffic than I do.