The lightest wood used commercially, it's used to build model airplanes & some kinds of buoys
Some balsa may be super soft and feel as light as a feather while other pieces 
in the... [DOC] [TLE] Personal flotation device - Wikipedia [PAR] A personal flotation device is a piece of equipment designed to assist a wearer to 
keep afloat in ... Kapok buoyancy was used in many navies fighting in World War 
II.