NOVELTY - An article having a repellant surface, comprises: a substrate comprising a roughened surface; and a lubricating liquid wetting and adhering to the roughened surface to form a stabilized liquid overlayer. The liquid covers the roughened surface at a thickness sufficient to form a liquid upper surface above the roughened surface, where the roughened surface and the lubricating liquid have an affinity for each other such that the lubricating liquid is substantially immobilized on the substrate to form a repellant surface.    USE - As a flow channel, optical component, a sign or commercial graphic, a building material, an element of a refrigeration system (where preventing or reducing accumulation of ice, frost or condensate is advantageous, like coil, pipe, fin, cartridge of fins or wall), a heat exchanger, a fabric, fingerprint resistance surface (which is contained in a lens, goggle, a touch screen, or a window), a building, a billboard, a sink, or a toilet bowl; and also in a device (selected from a wind mill, a solar cell, and avionic device, a marine vessel, roofing material, and an underwater device) (claimed).    ADVANTAGE - The article is capable of repelling a foreign material, and reducing the adhesion of the foreign material to the repellant surface. The affinity of the roughened surface for the lubricating liquid is greater than the affinity of the roughened surface for the foreign material. The article or the slippery surface maintains its properties when in contact with the foreign material at pressures in excess of 5000 or 106 Pa; and is capable of self-cleaning and self-healing. The present slippery liquid-infused porous surfaces outperforms other conventional surfaces in its capability to repel various simple and complex liquids (e.g. water, hydrocarbons, crude oil and blood), maintain low-contact-angle hysteresis (less than 2.5 degrees ), quickly restore liquid-repellency after physical damage (within 0.1-1 seconds), resist ice, microorganisms and insects adhesion and function at high pressures (up to at least 690 atmosphere).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a device having at least one surface exposed to wind or water resistance, where the exposed surface comprises the article;    (2) a fluid transport device, where at least a portion of a fluid contacting surface comprises the article;    (3) a container, where at least a portion of a container surface comprises the article;    (4) producing (p1) a slippery surface for repelling a foreign material involving: providing a roughened surface; and introducing a lubricating liquid to wet and adhere the lubricating liquid to the roughened surface to form an over-coated layer;    (5) transporting (m1) a fluid under pressurized condition, involving: providing a flow path with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface to form an over-coated layer; and sending a fluid along the flow path, where the roughened surface has a greater affinity towards the lubricating liquid as compared to the fluid, and the lubricating liquid and the fluid are substantially chemically inert with each other;    (6) improving (m2) a defrosting cycle of a cooling system involving: providing a cooling element with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface to form an over-coated layer; connecting the cooling coil into a defrost system of the cooling system; heating the cooling coil to melt frost formed on the cooling coil, where the roughened surface has a greater affinity towards the lubricating liquid as compared to frost, and the lubricating liquid and frost are substantially chemically inert with each other;    (7) building (m3) a pest repellent building, involving: providing walls of a building with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface to form an over-coated layer, where the roughened surface has feature sizes that are smaller or larger than the size of a gripping mechanism of the pest, and the lubricating liquid and the pest are substantially chemically inert with each other;    (8) cleaning (m4) a surface of an article involving: providing a surface of an article with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface; and providing a fluid that collects contaminant accumulated on the article during use of the article, where the roughened surface has a greater affinity towards the lubricating liquid as compared to the fluid, and the lubricating liquid and the fluid are chemically inert with each other;    (9) preventing (m5) marine bio fouling on a water vessel, involving: providing a surface of a marine vessel with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface to form an over-coated layer; and deploying the marine vessel into a marine environment, where the roughened surface has a greater affinity towards the lubricating liquid as compared to marine contaminants and the marine environment, and the lubricating liquid and the marine contaminants/environment are chemically inert with each other; and    (10) creating (m6) a self-cleaning, anti-sticking optical surface involving: providing a surface of an optical device with a roughened surface and a lubricating liquid that wets and adheres to the roughened surface to form an over-coated layer; and providing a fluid that collects contaminant accumulated on the optical device during use, where the roughened surface has a greater affinity towards the lubricating liquid as compared to the fluid, the index of refraction of the lubricating liquid is similar to the index of refraction of the roughened surface, and the lubricating liquid and the fluid are chemically inert with each other.