The best current evidence is that media are mere vehicles that deliver instruction but do not influence student achievement any more than the truck that delivers groceries causes change in our nutrition.

Summary

This quote suggests that media, such as educational materials delivered to students, do not directly impact or improve student achievement. Instead, they are likened to vehicles that merely deliver instruction, similar to how a truck delivers groceries without influencing our nutrition. The quote implies that the true influence on student achievement comes from how the students engage with the instructional materials rather than the media itself.

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