The Front Cover shows a scheme of the working principle of μFlowCal. This flow microcalorimeter is designed towork in isothermal conditions, in differential mode and in the absenceof gas phase, requiring small amounts of sample (200 μL). Both themicrocalorimeter and its operational methodology were optimized tomeasure the heat of mixing of fluids with moderate viscosity andvolatility. More information can be found in the Research Article by Inês C. M. Vaz et al.