How do we prevent the drains? I mean the "Brain Drain", "Wealth Drain", "Cultural Drain", "Moral Drain", etc?

By providing the prerequisites to put such valuable assets in effective local use. Prerequisites include economics, legislations, R&D resources, empowerment. All this can be achieved only if reserving these assets is an essintial part of the national strategies. In other words, we should first aim for this in order to achiev it.