The participating countries vary from year to year.

Some countries vary the actual date of their celebrations so that the holiday occurs on a Monday close to 1 May.

Because of its controversial nature, different countries vary in the discussion of bestiality.

One reason is that European countries vary in both their production and dependence on high-carbon fuels.

In India, a country far more complex than most, the rules vary from region to region and even village to village.

Many countries have different laws and customs for men and women, what may be allowed or perceived often varies by gender.

Basketball concepts were almost as foreign as the food to some of the players, whose countries vary greatly in their on-court development.

How does this happen in a world of such global economic imbalance, where countries vary greatly in the resources they can put into fighting disease?

However, these countries vary greatly in the circumstances under which abortion is permitted.

However, these countries vary in terms of their economic development.