Nature walk challenges in our neighbor hood: To just look and discover things they were interested in.
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Here is a science experiment on Sea creatures: The challenge was to see how long they could hold their hand in ice water with one rubber glove, then we added a layer of Vegetable Shortening (blubber) and timed ourselves again. The time went up from 45 seconds to about 3 minutes. But mostly lasting longer than the other brother!