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Answer:
Many natural phenomena are easy to understand and exploit by simple observation or modest tinkering. No science needed. But some, like capacitance, are much less obvious, and then you really need science to understand them. In some cases, the HCI system that is built generates its own phenomena, and you need science to understand the unexpected, emergent properties of seemingly obvious things. People sometimes believe that because they can intuitively understand the easy cases (e.g., with usability testing), they can understand all the cases. But this is not necessarily true. The natural phenomena to be exploited in HCI range from abstractions of computer science, such as the notion of the working set, to psychological theories of human cognition, perception, and movement, such as the nature of vision.