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spec: Dr. Schmidt describes the new discipline of tissue engineering as a " more natural , biologically based approach to repairing or replacing tissue functions . They also cover activities aimed at repairing or restoring damage to the environment after it has occurred . He ` repayeth them that hate him to their face . With advanced technology and a smaller world of porous borders , the ability to unleash mass sickness , death , and destruction today has reached a far greater order of magnitude .