Science for elementary is the most fun yet complicated lesson ever. When i was still in university, my lecturer ever told me that elementary is the basic stage to form the kids mind. I will explain it as if it's a formed object. when the teacher creates round objects inside the kids mind, these kids' brains will keep it as round objects forever for their entire life. Later on, along to their growth, they will solve every problem in round way.
When the kids used to think in scientific way, means that everything have a reason to be happened, they won't just take everything easily, they will have many questions to be answered. In the end, they start to solve it no mater how just to satisfy their hunger of knowledge. This is how the scientist and the leader have been created. They have big curiosity over something that catch their interest, and struggling in finding a way to solve that thing.
But now, what if the teachers think that the elementary is the easiest stage of school life? in Indonesia, many teachers that i know used to think to not take the elementary students seriously. For them, no need to explain the materials in detail. The kids have been trained to accept everything as it is, no more questions, no more explanations. Get it or leave it. With this method, i'm pretty sure, in the future, their students will grow up as employees. People might think: why? nothing's wrong with being an employee right? they are not jobless though. Yes, nothing wrong with it, but if we can create the trend setter why should we create the follower? if we can create the producer, why should we create the consumer? End of the arguing.