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Anatomy
There are three parts of your ear. The outer ear, the middle ear, and the inner ear. The outer ear is made of cartilage, which gives its shape and stiffness. The purpose of the outer ear is to catch sound waves so that they can go down the auditory canal,
Anatomy
Taste is an important sense that helps you decide what is good or bad for you. Things that are good for you usually taste good, and things that are bad usually taste bad. There are four main flavors: sweet, salty, sour, and bitter. Some scientists also include a fifth taste
Oceanography
Sediments are any loose material that can be carried by a liquid and eventually settles at the bottom of it. In the ocean, sediments are composed of inorganic and organic material. Different sizes of sediment have different names, and they range from boulders to clay. Sediment particle diameters range from
Oceanography
It is believed that there once was a gigantic continent called Pangaea. The first person who had this theory was Alfred Wegener, who thought that 250 million years ago, all the continents were together in one big continent, which he called Pangaea, which was the Greek word for "all
History
This is a timeline of medieval history events, from 324 AD to the Renaissance period. 324 AD: Constantine I becomes Emperor. He wins two decisive battles against Licinius, the last remaining emperor of the Tetrarchy, which solidifies him as the Emperor of the Roman Empire. In the Battle of Adrianople,
Literature
In the first part of "The Pilgrim's Progress", a man from the City Of Destruction is convinced that the city will be destroyed and decides to leave to escape. He meets a man named Evangelist who tells him that he should go to the Celestial City
Anatomy
The Braille Alphabet is a form of written communication to help blind people read. It uses a system of raised dots that represent letters of the alphabet. For example, the letter A is represented by one dot in the upper hand left corner of a matrix of six dots in
Oceanography
People have only explored about 5% of the world's oceans, so we don't know all there is to know about them, but one of the limitations we have is the underwater pressure. Up here, on the surface of the Earth, we have a comfortable pressure of
History
The Middle Ages started in 500 AD (when the Roman Empire collapsed) and ended in 1500 AD (the beginning of the Renaissance). During this time were the dark ages, Crusades, the 100-year war, and other important events. The first part of the Middle Ages (called the Dark Ages) started in
Biology
Brain surgery began a long time ago. Since ancient times, people have been trying to figure out the brain and help people who had problems with it. People had developed a method for helping out, called trepanning. Trepanning was the process of drilling a small hole in the patient'
History
The Incas were an advanced civilization in South America. They were ahead of the Aztecs and many other ancient civilizations in North America because they knew how to mine for precious ores and useful metals. Mining was mandatory in the Inca Kingdom. It was part of the tax obligation from
History
The Songhai Empire of West Africa began in 1375 and ended in 1591. This empire began when Mali started being weakened and the Songhai people rebelled, fighting back and setting up their capital in the city of Gao. The Songhai eventually took over (under the rule of the former military