If you are good at some things, are ou more likely to be good at others?

Forget the topic of study, the question itself if fascinating.

BBC NEWS | Health | Intelligent 'have better sperm':

"..., people with robust genes might be blessed with a biological 'fitness factor' making them fit, healthy and smart.

Previously, scientists tended to assume that lifestyle factors were more likely to underlie any relationship between intelligence and health.

For instance, brighter people may be less likely to smoke, and more likely to take exercise, both of which are known to impact on mental performance....

The latest study tested the gene theory by taking two characteristics that seemed unlikely to be associated with each other - intelligence and sperm quality.

They found a small, but statistically significant link, and were able to show that this could not be explained by unhealthy habits, such as smoking or drinking alcohol."