Contributors in World history
World history
Rudder
History; World history
A device used to steer a ship. It is usually shaped like a paddle and is on the back of the boat.
Greenhouse gas
History; World history
A gas such as carbon dioxide, ozone, or water vapour that are a factoring the warming of the Earths atmosphere.
Isaac Newton
History; World history
(1642-1727) English scientist who discovered gravitation, invented calculus, and formulated the laws of motion.
Pierre Curie
History; World history
(1859-1906) French scientist. He is best known for his work with his wife Marie in the field of radioactivity.
Darius I
History; World history
(558?BCE 486BCE) King of Persia who expanded his empire to extend from the Mediterranean to the Indus River.
Civilization
History; World history
The type of culture and society developed by a particular nation or region.(e.g., The Maya or the Roman Empire).
Astrolabe
History; World history
A device used to determine latitude by observing the altitude and position of the sun or other start or planet.