(Wcsa.world) A light bulb (an incandescent light bulb, incandescent lamp or incandescent light globe) is an electric light with a wire filament heated until it glows.
(Wcsa.world) A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
(Wcsa.world)A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium (such as paper or cloth), thereby transferring the ink.
(Wcsa.world) A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill.
(Wcsas.world) A screw is a type of fastener, sometimes similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ridge, known as a male thread (external thread) or just thread.
(Wcsa.world) The first indications of constructed roads date from about 4000 BC and consist of stone paved streets at Ur in modern-day Iraq and timber roads preserved in a swamp in Glastonbury, England.
(Wcsa.world) The World Creativity Science Academy (WCSA) on March 16, 2014 organized a ceremony in the city of Faridabad, New Delhi, India to present its Academician Certificates to two professors, each from Vietnam and India.