Placement

I read a report this morning about someone who had invented an alarm clock which won't turn off until you enter in a corresponding sequence of flashing lights (to ensure your pre-frontal cortex is as awake as the rest of you). Then I read the items immediately underneath it - Ads by Google. This interests me. Is it automated? Triggered by key words? Manually inserted? Who pays for them? How many do you get for your money? Do you only pay if people click the links? I'm off to find out more.

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