But the true test of a stock market star is whether a consistent track record of exceptional returns can be maintained over the course of several years. (cnbc.com)
The researchers will be monitoring the study subjects over a period of several years in order to document their mental health and the stress factors to which they are exposed over time. (sciencedaily.com)
It also presents the results of several years of collaborative scientific study of the paintings. (aaas.org)