COVER Seven aqueous streams, each colored with a different dye, converge in a microchannel and proceed in parallel laminar flow, without turbulent mixing. Using laminar flows of reagents is the basis of a technique for fabricating microstructures inside capillaries. The stream presentation was designed with the help of F. Frankel, who also photographed the sample. [Image: © Felice Frankel] See page 83 [Photo: FPG]

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