An old style calculator, the kind that prints. I attribute some of DS7s crazy number sense to hours spent mashing the calculator adding and multiplying numbers.

We've joked that we measure DS age by the number of minutes that pass before he needs an audience. Figure it's been increasing about ten seconds a month.

Since he was a whole word sight reader, magnetic poetry was quite popular for a while. Oh yeah, and almost anything on the TV with closed captioning on.

Oddly an abacus barely caught his attention.