Cosmologists are scientists who study the universe as a whole, including its origins, evolution, structure, and eventual fate. They seek to understand fundamental questions about the cosmos, such as the nature of dark matter and dark energy, the formation and evolution of galaxies, the cosmic microwave background radiation, and the overall geometry of the universe. Cosmologists often utilize principles from physics and astronomy, employing both observational data and theoretical models to develop their understanding of the universe.

Metallaboranes are a class of chemical compounds that consist of boron atoms and metal atoms, forming a framework that includes clusters of boron. They are often characterized by their unique cage-like structures, which can include various transition metals. Metallaboranes are of interest in coordination chemistry and materials science due to their interesting electronic properties and potential applications in catalysis and as precursors for the synthesis of other compounds.

A "superatom" is a term used in chemistry and material science to describe a cluster of atoms that exhibit collective properties similar to those of a single atom. These clusters can behave in unique ways that are not present in individual atoms or larger assemblies of atoms. Superatoms are typically formed by combinations of metal atoms or a combination of metal and non-metal atoms.

"Channels" can refer to several concepts depending on the context. Here are a few possibilities: 1. **Communication Channels**: In communication theory, channels are the mediums through which messages are transmitted. This can include verbal communication, digital platforms, email, social media, and more. 2. **Distribution Channels**: In business and marketing, channels refer to the pathways through which products or services reach consumers. This can include direct sales, retail outlets, online platforms, and wholesalers.

Crystallographers are scientists who study the arrangement of atoms within crystalline solids. Their work involves analyzing the structure of crystals to understand their physical and chemical properties. This field of study, known as crystallography, often utilizes techniques such as X-ray diffraction, neutron diffraction, and electron diffraction to determine how atoms are organized in a crystal lattice. Crystallographers play a crucial role in various applications, including materials science, chemistry, biology, and solid-state physics.

Experimental physicists are scientists who investigate physical phenomena by conducting experiments to gather data and test theoretical predictions. Their work often involves designing and building experimental setups, using sophisticated instruments, and analyzing data to understand the fundamental principles of nature. The main roles of experimental physicists include: 1. **Designing Experiments**: They create experimental protocols to test specific hypotheses or explore new phenomena.

"Lists of physicists by field" typically refers to organized compilations of physicists categorized according to their specific areas of expertise or research within the broad field of physics. These lists can be useful for educational purposes, historical research, or simply to recognize notable contributions made by physicists in various subfields. Some common categories or fields within physics that such lists might include are: 1. **Theoretical Physics** - Physicists who primarily focus on developing theories and models to explain physical phenomena.

A **Schreier vector** is a concept that arises in the context of group theory, particularly in the study of group actions and the construction of permutation representations of groups. The term is often associated with the use of the **Schreier graph** and can refer to a specific way of organizing cosets of a subgroup within a group.