The prefix “poly-“ comes from the Greek word “polys,” meaning “many” or “multiple.” It is used to indicate something that involves or consists of many parts, elements, or quantities.

Examples:

• Polygon: A shape with many sides (e.g., a triangle, square, pentagon).
• Polyglot: A person who knows and can use multiple languages.
• Polytheism: The belief in or worship of many gods.

The word “algebra” comes from the Arabic language. It is derived from the Arabic word “al-jabr”, which means “reunion of broken parts” or “completion”. The term was introduced by the Persian mathematician al-Khwarizmi in his 9th-century book, “Al-Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala” (The Compendious Book on Calculation by Completion and Balancing). This work laid the foundations for algebra as a branch of mathematics.

The Greek root “demos” means “people” or “population.” It is the basis for many words related to the concept of the people or community.

Examples:

• Democracy: A system of government where the people have the power to make decisions.
• Demography: The study of the population, including statistics on birth, death, and other aspects.
• Demagogue: A political leader who seeks support by appealing to popular desires and prejudices rather than rational argument.

In essence, “demos” relates to people or the public in various contexts.

The prefix “neo-“ comes from the Greek word “neos,” meaning “new” or “recent.” It is used to indicate something that is new, revived, or a recent version of something. It often refers to a modern adaptation, movement, or style that is based on older ideas or traditions.

Examples:

• Neoclassical: A revival or adaptation of classical styles or ideas.
• Neoliberal: A modern form of liberalism, often associated with free-market capitalism.
• Neonatal: Relating to newborns or the period immediately after birth.

The International Space Station (ISS) is made up of a variety of materials designed for its unique environment in space. Here are the key components:

1. Structural Components:
   • Aluminum Alloys: The main structure of the ISS, including the truss and frame, is primarily made of aluminum alloys. Aluminum is lightweight yet strong and resistant to corrosion, which makes it ideal for the harsh environment of space.
   • Titanium: Some parts of the ISS, such as certain joints and support beams, are made of titanium due to its strength, low weight, and ability to withstand extreme temperatures.
2. Solar Panels:
   • The ISS is equipped with large solar panels made from photovoltaic cells that convert sunlight into electricity. These panels are crucial for providing power to the station.
3. Thermal Protection:
   • The ISS has a variety of thermal protection materials to maintain a stable temperature inside the station. This includes insulation materials like multi-layer insulation (MLI), which helps regulate temperatures and protect the spacecraft from the extreme temperatures of space.
4. Hull and Outer Coating:
   • The outer surface of the ISS is coated with thermal blankets and white paint to help reflect sunlight and manage heat. This also helps protect the station from micrometeoroids and space debris.
5. Windows:
   • The ISS has specialized windows made of glass and other materials that can withstand the pressure and harsh conditions of space. They are used for observation, including the Cupola, which offers a panoramic view of Earth.
6. Interior Materials:
   • Inside the ISS, the walls, flooring, and other surfaces are made from materials like composite materials, polycarbonates, and kevlar, designed to be lightweight and resistant to radiation, as well as easy to maintain in the microgravity environment.

In essence, the ISS is a complex assembly of advanced materials that ensure its durability, functionality, and safety while orbiting Earth.