Boat floats upside down on levitating liquid like scene from Pirates of the Caribbean

Scientists have demonstrated tiny boats that float upside down underneath a levitating layer of liquid in an amazing quirk of physics. Researchers in Paris were investigating the effect of vertical shaking, which can be used to suspend a layer of liquid in mid-air. Not only was the layer of liquid able to float on a suspended cushion of air, but small model boats floated on the bottom surface, thanks to intense air pressure. This counter-intuitive behaviour is a result of the constant vibrations, which change the forces acting on the floating object. This case of'reverse-buoyancy' might have a practical uses in transporting materials through fluids and separating pollutants from water.