Oxidative stress and aging is a multi-dimensional/factorial subject matter encompassing different degrees of organism complexity (from single-cell animals to humans), different molecules (DNA, RNAs, proteins and lipids), different cellular components (mitochondria, cytoplasm and plasma membrane), different tissues and organs, and different human subpopulations including those with different "lifestyles." This book roughly follows this complexity hierarchy, from molecules to organisms; and within each section, pro- and anti-oxidant components will be presented and human implications will be discussed. Some overlap in coverage of topics is anticipated and this is deemed both necessary and preferable for the existing literature is often controversial. The book concludes with a chapter focusing on possible lifespan extension strategies based on our understanding of oxidative stress protection. A short preface in each of the major sections will be included to summarize the section and briefly mention other topics not specifically covered by the chapters within. The following chapter titles are tentative and will be adjusted according the contributors' preferences.