Congratulations! I Liked the article very much.
I just have some doubts about two specific points:
In the part that there's the text:
"And when your life is on the line, things like impressing your friends and buying organic pale in comparison."
I got the impression that it's missing the end of the sentence. As my english is not good, maybe it's my fault. Sorry if that is the case.
The other thing is that I found a little problematic the math comparing U$ 10.000 spent on a U$ 500 charity with overhead of 50% and the one spent on a U$ 10.000 charity with 0% overhead. It's said that in the first case we could save 10 people and in the second just 2. Isn't that 20 people in the first case?