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Thanks to science curriculum in previous grades, your fourth grade scientist probably feels pretty confident recording temperatures, classifying common clouds, and identifying different kinds of weather. So here's a new challenge: Record your backyard highs and lows, check them against the ones in your local paper, and then see how today's highs and lows compare with those 50 years ago. Is your town cooler, warmer, or the same over a two week period? Here's how to start exploring that question.