Sound is a vibration or wave that travels through matter (solid, liquid, or gas) and can be heard. The vibration is triggered by a mechanical movement, such as someone plucking a guitar string or knocking … Read more

Archimedes is one of the most interesting figures in ancient Greek history. He lived in the city of Syracuse, where he solved problems and invented inventions for the king. He was one of the great … Read more

An element is a pure substance made up of one type of atom. Elements are the building blocks of all the rest of matter in the world. Examples of elements include iron, oxygen, hydrogen, gold, … Read more

Our bodies need food to provide energy, vitamins and minerals. However, in order to use food, we must first break it down into substances that can be used by various organs and cells in our … Read more

The “National Anthem of Chile” (Spanish: Himno Nacional de Chile, pronounced [ˈimno nasjoˈnal de ˈtʃile]), also known as Canción Nacional ([kanˈsjon nasjoˈnal]; ‘National Song’) or by its incipit Puro, Chile, es tu cielo azulado (‘How pure, Chile, is your blue … Read more

Turkic-speaking nomadic people first settled Kyrgyzstan about 201 BC. Islam took over as the area’s main religion in the 12th century. The majority of what is now the Kyrgyz Republic was populated by the Kyrgyz … Read more

Pietersite is a unique and striking gemstone known for its charming chattering properties and vibrant color variations. It is a type of chalcedony, which is a type of quartz, and is primarily made up of … Read more