Lori,

Aggressiveness was a definition of toughness in some other book summaries I read. I was looking for an accepted definition.

In chapter 9, it did mention kids below 7 have the highest survival rate. And from 8 to 12 have the lowest.

Thanks for the tip on the movie. I can watch it on Netflix.

Here is the definition according to Merriam-Webster. I kind of like the first one the best.

1. a: strong or firm in texture but flexible and not brittle b: not easily chewed <tough meat>

2. glutinous, sticky

3: characterized by severity or uncompromising determination <tough laws> <tough discipline>

4: capable of enduring strain, hardship, or severe labor <tough soldiers>

5: very hard to influence : stubborn <a tough negotiator>

6: difficult to accomplish, resolve, endure, or deal with <a tough question> <tough luck>

7: stubbornly fought <a tough contest>

8: unruly, rowdyish <a tough gang>

9: marked by absence of softness or sentimentality <a tough critic>