What I know so far is that alot of things that science has proven, has been explained in the Buddhist teachings, and what Science is yet to find or prove thus far, has been explained in the Buddhist teachings as well.
I do not think that learning science is a hindrance or detriment to spiritual practise. Because to me, spiritual practise is practising to transform yourself for the better, to achieve qualities closer to that of the Buddha. So that doesnt really need science to analyse and prove, because it can be done if you want to.
I don't think also that we have to unlearn everything in order to practise the Dharma. I think it should be that we learn that everything we knew wasn't exactly bringing us happiness therefore using our past experiences, we learn new things by changing ourselves, and our persepectives. We change (or I guess we could use 'unlearn' here) who we were with our defilements and become (or 'learn') a better person. That's practising Dharma. Using our past experiences to teach us so that we have a better tomorrow.
Whatever we have been taught is not wrong per se, it is just that it was influenced by what society knew, what those around us know, what society knows to be right, what our parents, and peers were brought up to think was right. In their mind it is right. But learning the Dharma doesn't make it wrong, I feel it just makes us realise that society doesn't know a better solution to finding happiness. It makes us have a clearer understanding and direction to seeking happiness, liberation and a better future. Maybe people arent' seeking that, so all their wordly pursuits, are still right, because that is their goal and aim.