A new theory on just what causes Earth's worst mass extinctions may help settle the endless scientific dust-up on the matter. Whether you favor meteor impacts, volcanic eruptions, cosmic rays ...

Society is depicted as fluid, stable, and becoming increasingly middle class due to technological progress, the rise of universalistic standards, and the growing importance of education. In particular ...

According to strain theory, society has failed these people with false promises, denying them opportunities to succeed in legitimate enterprises and driving them into crime. Dr.