I've a Quad Core, System Profiler shows 8

Maybe a dumb question, but why, when clicking on the CPU usage (Command 2) does System Profiler show 8 columns? What (simple thing) am I missing?

Hyper-threading. It lets one processor run two threads, so while waiting for data from memory, it can switch to the other thread, whose data may already be in cache. The operating system sees the processor as if it were two processors.

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