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    By the end of this module, you will be able to:
    -State and explain the four forces of nature.
    -Outline the historical development of theories about intermolecular forces.
    -Discuss the various categories of intermolecular forces.
    -Compute the surface energy of a liquid.
    -Describe the relationship between wettability and contact angles.
    -List the examples of adhesion in biological systems.