The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in anatom's nucleus, which ge...
Benjamin Banneker was an African American astronomer, clockmaker, and publisher who was instrumental in surveying the District of Columbia. He used his interest and knowledge of astronomy to create almanacs that contained information about the motions of the Sun, Moon, and planets. Early Life Benjami...
1819. His father, a well-known publisher, died when his son was only nine years old. Foucault grew up in Paris with his mother. He was frail and often sick, and as a result he was educated at home until he entered medical school. He decided early on that he couldn't handle the si...