1.   Almost all of us can improve our body size and shape with a good fitness program, but only to a point.

2.   By implication it denies racial differences in facial structure, body size and a number of metabolic predispositions.

3.   For their body size, these birds lay very small eggs.

4.   Overweight individuals tend not to be so relaxed about fluctuations in body size as slim people.

5.   So it seems that evolution has led to increasing intelligence simply because it has led to increasing body size.

6.   The other part of the explanation is body size.

7.   The requirement for large body size arises from the fierce battles between males for access to females.

8.   Their brains are larger in absolute terms than those of chimps but relative to body size, they are considerably smaller.