Ideals --- Imaging --- Immune Networks --- Inertia --- Infinity --- Inflation --- Information Theory --- Infrared Background Radiation --- Instantons --- Insulators (Electrical) --- Integer Quantum Hall Effect --- Integral Equations --- Integration --- Interfaces --- Interfacial Electrochemistry --- Interferometers --- Intergalactic Medium --- Interpretation of Quantum Mechanics --- Interstellar Clouds --- Interstellar Medium --- Inverse Methods --- Invisibility --- Ion Beams --- Ions --- Iron --- Irreversibility --- Ising Model --- Isoscalar Factors ---