Cosmic rays are high-energy particles originating from outer space that can interact with the Earth's atmosphere and reach the surface. The potential health threats from cosmic rays primarily concern exposure to ionizing radiation, which can have several effects on human health.

Creation myths are traditional stories or narratives that explain how the universe, the Earth, and humanity came into existence. These myths are often foundational to the beliefs and cultures of various societies and can serve various purposes, such as providing a sense of identity, explaining natural phenomena, or establishing moral and social order.

Mario Hamuy is a noted Chilean astronomer, recognized for his research in astrophysics, particularly in the study of supernovae and cosmology. He has made significant contributions to our understanding of the expansion of the universe and the role of dark energy. Hamuy is also involved in the development and use of astronomical observatories and instruments. In addition to his research work, he has been engaged in science communication and promoting astronomy education in Chile and beyond.

Bangladeshi astronomers refer to individuals from Bangladesh who study astronomy or are involved in related fields such as astrophysics, space science, and observational astronomy. Bangladesh has a growing interest in space and astronomy, with several institutions dedicated to research and education in these fields. Organizations such as the Bangladesh Astronomical Society and various universities are engaged in promoting astronomy through public outreach, observations, and research. Additionally, Bangladesh has been involved in international collaborations and has participated in various space missions and initiatives.

A creation myth is a symbolic narrative or story that explains how the universe, the world, and life began. These myths often convey the beliefs, values, and cultural identity of the people who tell them. Creation myths can vary widely among different cultures and religions, but they typically address fundamental questions about existence and the origin of humanity.

CP/M (Control Program for Microcomputers) is an early operating system that was widely used in the late 1970s and early 1980s for personal computers. Developed by Digital Research, CP/M became a standard platform for microcomputers, especially those based on the Intel 8080 and Zilog Z80 CPUs. Over time, various variants of CP/M were created to serve different hardware architectures and user needs.

The International Electrotechnical Exhibition (IFA) is a major trade show held annually in Berlin, Germany, that focuses on consumer electronics and home appliances. It serves as a platform for companies to showcase their latest innovations and products in the fields of electronics, technology, and home appliances. IFA attracts exhibitors from around the world, including leading manufacturers, startups, and industry experts. The event typically features product launches, demonstrations, and presentations, as well as panel discussions and networking opportunities for industry professionals.

Elimination theory is a branch of mathematical logic and algebra that deals with the process of eliminating variables from a set of equations or polynomials to simplify the problem or to gain insights into the relationships among the variables. It has applications in various fields, including algebraic geometry, computer science, and systems theory. One of the key aspects of elimination theory is the idea of finding resultant polynomials.

"Terminal" is a novel by the author, Rebecca Roanhorse, that is part of her *Tunnels* series. Set in a dystopian future, the story explores themes of survival, resilience, and the complexities of human relationships in a world that has undergone significant change. The narrative typically includes elements of science fiction and incorporates cultural motifs that resonate with contemporary issues.

"The Fly" is a short story written by British author George Langelaan, first published in 1957. The narrative centers on a scientist who is working on a teleportation device. In the story, the protagonist, André Delambre, accidentally transforms himself into a fly while experimenting with his invention. This transformation leads to tragic consequences as he struggles to communicate and reverse the effects of his condition.

Octadecyltrichlorosilane (OTS) is a silane compound that consists of a long hydrocarbon chain (specifically an octadecyl group) attached to a silicon atom, which is further bonded to three chlorine atoms. Its chemical formula is C18H37Cl3Si. OTS is primarily used as a surface-modifying agent.

Stranski–Krastanov growth is a fundamental process in the field of materials science and nanotechnology, specifically concerning the growth of thin films and semiconductor materials. It describes a two-stage mechanism of heteroepitaxial film growth, where a thin layer of material (the "film") grows on a different substrate.

Thin-film memory refers to a type of memory technology that utilizes thin films—very thin layers of materials—deposited on a substrate to store data. This technology can be employed in various types of memory devices, including non-volatile memory, such as flash memory and certain types of dynamic random-access memory (DRAM).

A "mixed conductor" typically refers to a material or system that can conduct both types of charge carriers, namely electrons and ions. This term is often used in the context of electrochemistry and materials science. Here are some key points regarding mixed conductors: 1. **Types of Conductors:** - **Electronic Conductors:** Materials that primarily conduct electricity through the movement of electrons (e.g., metals).

Solid hydrogen refers to hydrogen in its solid state, which occurs at extremely low temperatures and under high pressures. Under standard conditions, hydrogen exists as a diatomic gas (H₂), but when cooled to temperatures below approximately 14 K (-259.15 °C or -434.47 °F) at atmospheric pressure, it can transition into a solid form. Solid hydrogen is characterized by its low density and unique physical properties.

Tribologists are scientists or engineers who specialize in the study of tribology, which is the science and engineering of interacting surfaces in relative motion. This field encompasses the principles of friction, wear, and lubrication. Tribologists work to understand how materials behave under different conditions of contact and movement, aiming to reduce friction and wear in mechanical systems, enhance the performance and lifespan of components, and improve the efficiency of machines.

A rolling-element bearing is a type of bearing that uses rolling elements to reduce friction between moving parts. These bearings typically consist of an inner and outer ring, along with rolling elements such as balls or cylindrical rollers situated between them. The primary purpose of rolling-element bearings is to support and facilitate smooth rotational or linear motion while minimizing wear and energy loss. ### Key Features: 1. **Rolling Elements**: The most common rolling elements are balls and cylinders (rollers).

A "surf break" refers to a location where waves break in a way that is conducive to surfing. It describes the specific spot in the ocean where the swell (incoming waves) interacts with the ocean floor, leading to the formation of rideable waves.

Skin is the largest organ of the human body, serving as a protective barrier between the internal organs and the external environment. It has several key functions, including: 1. **Protection**: Skin shields underlying tissues from physical damage, pathogens, harmful chemicals, and UV radiation. 2. **Regulation**: It helps regulate body temperature through the process of sweating and the dilation or constriction of blood vessels.

A propane torch is a handheld device that uses propane gas as a fuel source to produce a flame for various applications. It consists of a propane tank, a hose, and a nozzle or torch head that directs the flame. Propane torches are commonly used for tasks such as: 1. **Soldering and Brazing:** They are often used in plumbing and electrical work to join metal parts together.