The phenomenon has since been observed by several university groups around the world.

This is the first time such a phenomenon has been observed.

A similar phenomenon can be observed in the sports world.

This same phenomenon can be observed in a number of areas.

These phenomena are observed too often for them to be the product of the individual's development alone.

The phenomenon was first observed in 2002, and has grown each year.

Notably, the higher than average population growth rate is a recent phenomenon, observed since the 1970s only.

This phenomenon can be observed every day in the classrooms, she said.

The income effect is a phenomenon observed through changes in purchasing power.

This phenomenon of environmental deterioration has been observed even during the early 1990s.