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"Molecular physics stubs" often refers to short, incomplete, or underdeveloped articles or entries related to molecular physics on platforms like Wikipedia. These stubs typically contain just a few sentences or basic information about a topic, and they are marked for expansion. The purpose of labeling them as stubs is to invite contributors to provide more detailed content, thereby improving the overall quality and comprehensiveness of the information available.

Optics stubs typically refer to a type of calibration or testing tool used in fiber optic communications. They are short lengths of optical fiber that are used primarily for testing the performance of optical systems or for aligning fibers. Here are some key points related to optics stubs: 1. **Testing and Calibration**: Optics stubs are often used to connect to measurement equipment for testing purposes. They help in ensuring that the measurement system is properly calibrated.

"Quantum chemistry stubs" likely refers to small, incomplete entries or frameworks related to quantum chemistry in a database, research repository, or knowledge base. The term "stub" is commonly used in collaborative platforms like Wikipedia or scientific databases to denote articles that are underdeveloped or in need of expansion. Such stubs often provide a basic introduction to a topic, outlining fundamental concepts, key figures, or relevant theories without going into comprehensive detail.