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spec: Physiological harm during sample procurement is considered a risk ; however , other risks may be more important . Exploring music from Ancient Greece through the 20th Century . Indeed , with this information the user could set up end-to-end connections at will by commanding the individual network switches , and network operators would find it very difficult to bill for the service . This raises a much different public-protection issue . However , special classes may be organized when there is sufficient student interest in a particular project . From its very inception Theta Chi was planned as a national fraternity . Even within a state , different institutions may have different policies for when or if their education students must pass tests in order to complete their preparation programs . In addition , high-tech approaches may intimidate certain groups of clientele ( e.g ., older clientele ) .