I. What is EPR (ESR)?. * The quantum mechanics machinery (very concise, references to other books). * The X-band EPR spectrometer. * Basic elements of Advanced EPR (ENDOR, TR-EPR, Pulsed EPR, HF-EPR) * Paramagnetic Species in Condensed Phases: how and when do they appear? .i. Obtaining a radical from the diamagnetic parent compound. Examples.ii. Exploiting a stable radical or paramagnetic transition ion to get information Examples.iii. Detecting the already existing paramagnetic centres in various systems. Examples..5. EPR spectroscopy in liquid phase. Radical and radical ions. Patterns of the spectra in liquid media. Simulation of the spectra in solution: how to simulate spectra in solution..6. EPR spectra in the solid state. S=1/2 systems : organic and inorganic radicals, defects, transition ions . The g and A tensors. S>1/2 systems: triplet states, transition ions. The ZFS tensor.Examples.7. FAQs.(example: Why in some cases the powder spectrum looks so different from the axial-non axial models? Answer: It depends on the symmetry of magnetic g and A tensors and point symmetry of paramagnetic centres. For low symmetry systems and non coincidence of g and A axis and consequences on EPR).8. How to find help? How to have access? Where to find EPR centers (in Europe? In the world?), which facilities they give. The EPR societies, the leading EPR laboratories in different countries. The commercial machines, the firms.II. Applications.10. Radiation produced radicals.11. Biology.Protein constituents, structure, dynamics.Electron transfer reactions in proteins.(Hemes and FeS clusters).Photosynthesis and other light driven processes.Transient paramagnetic chromophores.Metalloproteins/enzymes.(Cu, Mn, Ni, Co, Mo, Fe).12. Chemistry.Radical reaction mechanisms in organic chemistry.Inorganic and organometallic radicals.Spin trapping.Polymerizaton reactions.Heterogeneous catalists.13. Physics, Material Science.Defects in materials.Charge carriers in conducting and semiconducting materials.Molecular Magnets.Surface properties.Radicals in Carbonaceous Materials.Mesoporous and nanoporous materials.14. MEDICINE.Free Radicals in Biomolecular Injury and Disease.Free radicals detection in vivo.intracellular free radical production by intact cells.Oxidative Stress.Free radicals detection in tissues15. GEOLOGY AND MINERALOGY, ENVIRONMENT, POLLUTION, FOOD QUALITY.Coal.MnII in marbles and other rocks.Trace amount of metal ions.Beer.Red Wine.Etc.16. Frequently Asked Questions