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A fmr @castl_uva grad student, now Ph.D., Christina Mulcahey, pointed this out to me a few years ago.
Anyhoo, lots of "science" activities for pre-k are really just art, or "wow, look at that" activities - which are fine! And fun for kids and their adults! But if we feel good about them because we think we're doing science, we're really not. Ok end of rant 
Sorry one more thing: Good science for pre-k has one simple idea that can be learned/observed. The lesson should be built around that idea - like, "animal babies often look like their parents". Or "many plants grow from seeds".
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