Bruce B. Clark believes that "no role, unless it is parenthood, provides a more awesome challenge than does teaching." He explores this idea in "The Challenge and Responsibility of the LDS Teacher." Uses of knowledge has changed since the Industrial Revolution. S. Lyman Tyler attributes this to libraries in "The Library and the Availability of Knowledge." Individuals each seem to interpret the timing of the Renaissance differently. In "The 'Renaissance' in Recent Thought: Fifteen Years of Interpretation," De Lamar Jensen addresses what the Renaissance can actually mean.