Although I feel very uneasy being told that nothing can be proven, I do understand the importance of viewing theories, like evolution, as incredibly useful concepts, supported by lots of good data, that helps explains a lot of observations. However, I think it is very important to talk about how not all 'data' is equally valuable; i.e that we can't take a theory and use any old data to say it is supported. All theories are not created equal, in terms of supporting data.