I love Flowing Data.
Which is one reason why I am highlighting this post.
Lessons for all ... not just data presenters ... but data readers. When you see a graphic - know where it is coming from. Know the context. Explore and understand the data that surround what you are looking at.
Yes. It's hard work - but how else can you unpick the truth.
And that my friends is absolutely necessary in the times we find ourselves living in.