I completely agree with you, Amy - if I could, I would add skeptical thinking to every grade, starting at about 3rd. I have talked to my daughter since she was quite young about making sure she knows what someone is talking about and definitely not taking numbers at face value.
My father used to explain to me how easy it is to lie with numbers. And people think that you tell them numbers, it makes it somehow more "accurate", but it's really just the spin they want to have...
Is it 25% less than the other, or is the other 33% more expensive? It's the same difference.
