Center of Gravity, the point at which all of the weight of an object appears to be concentrated. If an object rotates when thrown, the center of gravity is also the center of rotation. When an object is suspended so that it can move freely, its center of gravity is always directly below the point of suspension. An object can be balanced on a sharp point placed directly beneath its center of gravity. It is important for automobiles and trucks to have their centers of gravity located close to the road, because a low center of gravity gives them stability.
A group of scientists from Duke University have demonstrated a simplified cloaking device. Learn about the cloaking device that the Duke scientists created and find out if a real-life cloaking device is actually possible.
Lead is one of the most maligned metals on the periodic table and for good reason. Lead poisoning is serious. But the beleaguered element isn't all bad, especially when it's protecting you from radiation.