My youngest (5) was given a Cambridge BrainBox – Electronic Kits for Children and Schools on Monday and it rocks. Really simple way to build electronic circuits that make radios, alarms, lights go on and off, and (most importantly) fans fly up and hit the ceiling. He loves it and has spent that last few days assembling all sorts of things (and blowing the fuses in the set a few times). I can’t believe we didn’t get something like this ages ago (though we have Lego, Meccano and other similar things). The press-stud approach works really well for his hands and it’s robust enough to carry around to show people.
I’m sure it has potential for use in a children’s talk at some point.