A Neat Result Is Not Yet an Explanation — Science 6: Matter, Energy & Earth Systems

Two learners compare paper bridges. One strip is wide, short, and made from card; the other is narrow, long, and made from paper. The first holds more counters. A neat graph makes the difference easy to see. It does not, however, isolate which changed condition produced the difference. A graph can faithfully display a comparison while the comparison itself answers a narrower question than its makers intended.

The learners decide to investigate width. They use strips from the same material, match length and support spacing, and place identical counters according to a shared rule. They repeat with fresh samples because a bent strip may behave differently after use. Some counts vary. Instead of keeping only the largest, they preserve every planned record and discuss the range beside the mean.

Their revised claim identifies the method and conditions. It can be checked by another person and challenged by a new comparison. The improved explanation is not simply more confident; it is more traceable. Before the chapter, distinguish what the first graph shows from what its causal claim assumes. After the chapter, explain how an observation, a fair comparison, and a model contribute different parts of the reasoning.