The answer to this age-old question is that the modern can and can opener were invented at exactly the same moment. This had to be true because a can without a can opener (yes, they existed) is of very little value, and a can opener without a can is the sound of one hand clapping (i.e., less than worthless).
The can and the can opener are together a system. Between them, they make it possible to preserve, transport, and distribute foods.
In educational innovation, we frequently talk as though individual variables are sufficient to improve student achievement.
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