1 Parity Violation in Atomic Physics.- 1.1 Introduction.- 1.2 Parity.- 1.3 Elementary Particles and Forces.- 1.3.1 Leptons and Quarks.- 1.3.2 Forces and Interactions.- 1.3.3 Spin and Helicity (Chirality).- 1.3.4 Unified Theory of Weak and Electromagnetic Interactions (Standard Model).- 1.4 Parity-Violating Effects in Atoms.- 1.4.1 Phenomenology.- 1.4.2 Experiments.- 1.5 References.- 2 Theories on the Origin of Biomolecular Homochirality.- 2.1 Introduction.- 2.2 Observability of Chiral Molecular Structures.- 2.3 Kinetic Models for Unstable Equilibrium.- 2.4 Kinetic Models with Instrinsic Asymmetry.- 2.5 Parity-Violating Energy Differences Between Enantiomers.- 2.6 Homochirality from Stochastic Equations.- 2.7 References.- 3 Chirality and Group Theory.- 3.1 Introduction.- 3.2 The Principle of Pairwise Interactions.- 3.3 The Theory of Chirality Functions.- 3.4 The Approximation Methods.- 3.5 Determining the Lowest-Degree Chirality Polynomials.- 3.6 Qualitative Completeness and Supercompleteness.- 3.7 Counting Enantiomeric Pairs.- 3.8 References.- 4 Helicity of Molecules Different Definitions and Application to Circular Dichroism.- 4.1 Introduction.- 4.2 The Ideal Finite Helix.- 4.3 Real Molecules or Parts of Them, Fractions of a Helix.- 4.4 Rules.- 4.4.1 The Torsional-Angle-Rule (CIP).- 4.4.2 The IUPAC-Axis-Tangent-Rule.- 4.4.3 The Two-Tangent Rule.- 4.4.4 The Spade-Product Rule.- 4.4.5 The Spiral-Staircase-Rule.- 4.5 Some Applications.- 4.6 Summary.- 4.7 References.- 5 Anomalous Dispersion of X-Rays and the Determination of the Handedness of Chiral Molecules.- 5.1 Introduction.- 5.2 Normal X-Ray Diffraction.- 5.2.1 Scattering from a Crystal.- 5.2.2 Friedels Law and When It Breaks Down.- 5.2.3 Physical Origin of Anomalous Scattering.- 5.3 Past, Presence and Future Use of Anomalous Scattering.- 5.3.1 Outlook.- 5.4 References.- 6 Chirality in Organic Synthesis The Use of Biocatalysts.- 6.1 Chirality in Organic Chemistry and Biochemistry.- 6.1.1 Explanation of Bal3U