You could have a go at bringing together the 'explosion' with a schematic of the brain, suggesting ideas as well (like a lightbulb-head image)?

I'm wondering if the third one should suggest some of the ethical wossnames raised by science (sorry, workhat is still on), as I know places like the Science Museum want to raise this kind of thing these days. Something like a simlified cell / cell in petri dish or under microscope, which suggests learning about biology, but also issues like stem cells etc..