Automatically expanding referred nodes

I am creating a content management system for a school. For each science topic there may be experiments, activities, animations, movies, applications etc. (Some science topic ,all of them may not be there. And for some of the topics there could be mutliple activities or animations). For each of them I have created a different content type. ie one for actitivity, one for animation and so on. Now I need to link all these in to a master node for each science topic. So when I click on a master node for the topic, I want to see all the linked activities, animations, experiments etc.

I found nodereference and node-referrer useful. Is there any other module which help me do this?

Also now I can see on the link to the referenced nodes. Can I see the content of the reference nodes when I see the master node for the science topic?