1 - The once radical notion that birds descended from dinosaurs has grown stronger and stronger since paleontologists first started taking it seriously a couple of decades ago.

2 - If a couple decides to divorce, a number of major transitions of lifestyle and outlook have to be made.

3 - The business was started by a couple of enterprising young women.

4 - Negative emotions people may have suffered as young adults can have a lasting grip on their couple relationships, well into middle age.

5 - As an illustration of the health risks, in the case of a married couple where one partner is a smoker and one a non-smoker, the latter is believed to have a 30 per cent higher risk of death from heart disease because of passive smoking.