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Portable Network Graphic  |  1992-04-01  |  5KB  |  512x342  |  4-bit (3 colors)
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OCR: For example, the wave pattern used to diagram alternating electric current does not go zig zagging through the wires of your house when you flick on a light switch. What actually flows through those wires is a profound mystery. All we really know about electricity is that it is a way in which things behave when they are electrified- a set of conditions and results. If you're thinking, "Electricity is the stream of electrons" - all our scientists know about electrons is that they are "something unknown, doing we don't know what". And, as we'll see later, there are very M-W-W strict limits to what they'll ever know.