The tandem bicycle or twin is a form of bicycle (occasionally, a tricycle) designed to be ridden by more than one person. The term tandem refers to the seating arrangement (fore to aft, not side-by-side), not the number of riders. A bike with two riders side-by-side is called a sociable.
Mix an ingredient gently with (another ingredient), esp. by lifting a mixture with a spoon so as to enclose it without stirring or beating
foldable: capable of being folded up and stored; "a foldaway bed"
Bend (something flexible and relatively flat) over on itself so that one part of it covers another
(of a piece of furniture or equipment) Be able to be bent or rearranged into a flatter or more compact shape, typically in order to make it easier to store or carry
protein folding: the process whereby a protein molecule assumes its intricate three-dimensional shape; "understanding protein folding is the next step in deciphering the genetic code"
fold: a geological process that causes a bend in a stratum of rock
Bike Friday and Crew
Tandem Bike Friday folds up into two bags. It has been ridden across the Cascade Mountains. The Crew consists of the Captain (red shirt) and the Stoker. The Stoker provides the power for this two-engine bicycle.
Bernds tandem folding bike
somewere Belgian coast between Middelkerke and Koksijde