So, I know this is a long-since obsolete issue, but it really is a good thing for story purposes that none of the Cullens are experimentalists by nature. Hooking up an experimentalist with a precognitive is a balance-destroying arrangement... you get the results of any non-longitudinal experiment you make up your mind to perform, with a direct perception of whether that result is reliable or just a statistical fluke, without actually having to perform it.