Scratch is definately a very good option at that age! I have used it with work experience students visiting our research group for a week. See, for example, the mirror simulations we have done in Scratch.

For science related fun activities you can also use outreach games by large science projects, such as Space Time Quest in which the players are in charge of designing a graviational wave detector (disclaimer: I am one of the creators of Space Time Quest).

Andreas

Yes. No. The LHC might be the last collider to provide enough energy to find something really exciting. But, yes, a no-discovery so far does not mean anything but if in a few years time the LHC has not seen a new particle this would be a significant result. Andreas