It's actually incredibly common, and there's a biological reason for it.

However, the biological reason underlying this association is not understood.

The outsider may be different from everyone else for cultural, biological, psychological or even magical reasons.

It may be that I will never have more than these two children, for reasons logical or biological.

But it's never going to be 50-50, for biological reasons.

Surely there's no biological reason why women shouldn't enjoy ale.

Generally, for actual biological reasons, people do differentiate on the basis of color.

The protection of it is very important in biological, hydraulical, and economic reasons.

"Young boys tend to want to go out with girls who are older for biological reasons," she said.

"Are they just for people to enjoy, or is there a biological reason?"