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# Chapter 15. Apples and Oranges

There's an old saying, "That's like comparing apples to oranges." What it means is that it's sometimes unfair to compare dissimilar objects. I said "sometimes," because at other times it's completely fair. Suppose I hand you one apple and one orange. Which one is heavier? Which one has a larger diameter? These aren't unfair questions, are they?

So sometimes you can compare apples to oranges! And when it comes to your robots, there's a way for your robots to compare things, too—not apples and oranges, but numbers.

# Logic

Remember that we discussed the concept of Logic back in Chapter 8? True or False? (If you said False, you need to go back and read Chapter 8 again!)

Well, NXT-G comes with a programming block called the ...

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