A slot is a narrow aperture or groove, especially one in the wing of an airplane or other aircraft, to allow airflow over an area of the wing. In aviation, a slot may be a structural element, or it may refer to any of several aerodynamic features such as an airfoil, flaps, or winglets. A […]

A lottery is an arrangement where prizes are allocated by a process which relies wholly on chance. This is in contrast with an arrangement where the allocation of prizes is based on an underlying principle or system, such as a mathematical formula. For example, in the US, state and national lotteries generate about $100 billion […]