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Big companiesBig company

Google

Search is free to use. So who pays? Advertisers.

A giant search page: someone at a laptop types a question into the search box, and the top results are marked as ads. On the other side, two shop owners drop coins into a slot to put their ads at the top. Searching is free; the advertisers pay.ADAD?AD$$$

The lessons

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These lessons teach 6 of the 15 big ideas in Foundations.