NOVELTY - Compact multiple-stream hydrogen generator for making hydrogen, comprises a strip (1) of metal, which has been folded back and forth upon itself to form a monolith, at least a portion of the strip being corrugated, where pairs of folds of the strip define first and second fluid flow regions (31-48) in fluid communication with mutually opposite sides of the monolith.    USE - The generator is used for making hydrogen (claimed) for use in a fuel cell.    ADVANTAGE - The hydrogen generator is compact. The heat exchanger is capable of supporting all of the functions required in a catalytic steam reforming process, and allows heat transfer among greater than or equal to3 different fluid steams. Waste of energy is minimized.    DETAILED DESCRIPTION - Compact multiple-stream hydrogen generator for making hydrogen, comprises a strip of metal, which has been folded back and forth upon itself to form a monolith, at least a portion of the strip being corrugated, where pairs of folds of the strip define first and second fluid flow regions in fluid communication with mutually opposite sides of the monolith, the first fluid flow region(s) having walls, which are coated with a combustion catalyst and being designated a combustion chamber, the second fluid flow region(s) being coated with a steam reforming catalyst and being designated a steam reforming chamber, where each steam reforming chamber is in heat exchange relationship with a combustion chamber; fuel directing mechanism for directing a fuel to the combustion chamber; and steam and hydrocarbon fuel directing mechanism for directing steam and hydrocarbon fuel to the steam reforming chamber; and withdrawal mechanism for withdrawing hydrogen from the steam reforming chamber.    INDEPENDENT CLAIMS are also included for:    (1) a method of making hydrogen, comprising directing a hydrocarbon fuel into combustion region(s) of a monolith formed, by folding a corrugated strip back and forth upon itself to define fluid flow regions, at least some of the fluid flow regions defining the combustion region, which has a combustion catalyst; directing a hydrocarbon fuel into the fluid flow region(s) defining a steam reforming region of the monolith, the steam reforming region having a steam reforming catalyst; directing a stream of water into another of the fluid flow regions, while directing products of the combustion region into other fluid flow regions so as to be in heat exchange relationship with the stream of water, to produce steam; and withdrawing hydrogen from the steam reforming region; and    (2) a heat exchanger comprising a strip of material, including corrugations, the strip being folded back and forth upon itself to define first fluid flow regions alternating with second fluid flow regions, and conduit mechanism connected to some of the fluid flow regions, the conduit mechanism comprising conveying mechanism for conveying greater than or equal to3 distinct fluid streams into at least some of the fluid flow regions, to exchange heat with others of the streams.    DESCRIPTION OF DRAWING(S) - The figure provides a partially schematic diagram of the hydrogen generator.    Strip (1)    Fluid flow regions (31-48)