<P>Energy is typically regarded as understandable, despite its multiple forms of storage and transfer. Entropy, however, is an enigma, in part because of the common view that it represents disorder. That view is flawed and hides entropy''s connection with energy. In fact, macroscopic matter stores <I>internal energy</I>, and that matter''s entropy is determined by <I>how</I> the energy is stored. Energy and entropy are intimately linked.</P><P><STRONG>Energy and Entropy: A Dynamic Duo</STRONG><EM></EM>illuminates connections between energy and entropy for students, teachers, and researchers. Conceptual understanding is emphasised where possible through examples, analogies, figures, and key points.</P><B><P>Features:</P><UL></B><P><LI>Qualitative demonstration that entropy is linked to spatial and temporal energy spreading, with equilibrium corresponding to the most equitable distribution of energy, which corresponds to maximum entropy</LI><P></P><P><LI>Analysis of energy and entropy of