Marbles are small round balls that have been used as a toy since ancient times. They are usually made from glass, but can also be made from steel, clay, plastic and agate (a type of silica). The marbles can be used for a number of games that have the same . . . Read more
A chain is usually made of metal (steel, such as stainless steel is most commonly used) and is a series of joined or connected links. Chain can be made in many different styles and these have a number of important and decorative applications. Metal chains have been used for many . . . Read more
A magnet is an object that has the property of attracting certain materials (such as iron). It produces an electric field, which is the force responsible for attracting certain materials (iron, nickel, cobolt and some rarer materials) and repelling other magnets. Magnets are common in everyday life, from refrigerator magnets . . . Read more
Ball bearings are a special type of bearing that contain a specific number of metal balls that rotate freely. They are used for a number of applications, but their most important function is to reduce friction between moving parts. There are a number of different types of ball bearings, but . . . Read more
Synthetic diamonds (also called cultivated or cultured diamonds) are a type of diamond that is produced artificially. Traditionally diamonds are mined from beneath the earth (where they form under certain conditions). Diamonds have a number of uses, but they are best known for their use in the jewelry industry. The . . . Read more
A guitar string is a length of flexible material that is attached to the guitar. They are kept under tension and vibrate when played which causes the instrument to make a sound. The tension on the strings can be adjusted to tune the string to the right pitch. A standard guitar has 6 strings that are all tuned to different pitches. There are two main types of guitar stings known as plain or wound. Plain strings are made of a single material and wound strings have a single material core with another material wound around the outside. Traditional guitar strings were made of cow or sheep intestine (known as gut) and the wound strings were made of a silk thread core which was wound with gut. These strings are still sometimes used, but synthetic guitar strings are far more common today. Let’s find out how guitar strings are made.
Plastic bags are a type of lightweight bag made from any type of plastic material. They are used for transporting a number of products and are most commonly seen in grocery stores for transporting food. This type of bag is called a single use plastic bag because they are prone to breakage. However, they may be used for containing trash or storing items. Although plastic bags have been around since the 1950’s the modern single use bag was invented by Swedish engineer Sten Gustaf Thulin in the 1960’s. This process was patented in 1965 and this type of bag became the standard in the industry. Read on to find out how plastic bags are made.
Turnips are an edible root vegetable rich in vitamin C. The edible turnip roots are white, sometimes with a pink, red or green patch where the sun has hit the skin. These roots have been eaten by humans for centuries and today they are still grown and eaten throughout much of the world as well as being an important livestock feed. The leaves, also called turnip greens or turnip tops, are also edible and are a good source of vitamins A, K and C as well as folate. It is thought that turnips originated in Europe or the Middle East, but today they are grown throughout much of the world. Let’s find out how this vegetable is grown.
Isotopes are variants of a specific chemical element. For example, uranium-238, uranium-235 and uranium-234 are three isotopes of the element uranium. The listed numbers are the mass number and each isotope has a different mass number. This number is calculated by adding the amount of protons and neutrons that the isotope contains in the nucleus and it is one of the differences between isotopes from the same element. Let’s find out some of the most common similarities and differences between these isotopes.
The Voyager program consists of two unmanned space probes (Voyager 1 and Voyager 2) that were launched in 1977 to study the planets Jupiter and Saturn. These probes were built by the Jet Propulsion Laboratory and are funded and controlled by NASA. The probes were not only successful in this mission, but have continued their journey to the outer solar system and are still operational today. If you have ever wondered how they are powered and how they have remained running after all of these years, keep reading to find out.