. . . it's how this plane flies.
The Coandă effect (named for its discoverer) is the way in which a jet of air (or, for that matter, water) will travel over the surfaces adjacent to it, whether they're straight or curved. This allows an aircraft utilizing the effect to direct air from its engines across the curved surface of its wing, providing greater lift at low speeds, which in turn shortens the takeoff and landing speed significantly.
The 1970's experimental Boeing YC-14 used the effect to . . . well, to good effect!
The Boeing's competitor at the time, the McDonnell Douglas YC-15, went on to be developed into the very successful C-17 Globemaster III. Ironically, it became a Boeing aircraft when the latter company took over McDonnell Douglas in 1997. The YC-14 project was abandoned in the US, but appears to have inspired the (much smaller) Antonov An-72 and An-74 aircraft in what was then the Soviet Union. They achieved only moderate sales success, but it appears they may be making a comeback. A US company has just announced it will invest $150 million in Ukrainian manufacturer Antonov to restart production of the An-74.
Here's two video clips of a commercial An-74 freighter landing, then taking off. Note the thrust reversers, which appear above the engine as the aircraft lands. Note, on takeoff, how the thrust from the engines flows over the top of the wings, providing greater lift by using the Coandă effect to best advantage.
Strange-looking bird, isn't it? I'd like to see those high-mounted engines on some of the dirt airstrips I've used in Africa. I think they might offer a real advantage in terms of not ingesting dirt and rocks kicked up by the undercarriage . . . but I'm not so sure about low-flying buzzards over the runway!