1.   A crucial point about epidemics is that not all members of a given population behave in a uniform way.

2.   A model helicopter behaves in exactly the same way.

3.   All the complex factors that make children behave in certain ways will never be simple to identify.

4.   All wild creatures behave in the same way when presented with a cache of food and plenty of competition for it.

5.   An analysis of behavior naturally begins with simple organisms behaving in simple ways in simple settings.

6.   And if you know the history of the universe in imaginary time, you can calculate how it behaves in real time.

7.   As a result, both parties should always behave in good faith.

8.   As an entity, the United States behaved in the same way.