It is a cancer of the lymphatic system, which is a part of the immune system that consists of a series of ducts or tubes that parallel the arteries and veins throughout the body.

CNN: What is Hodgkin lymphoma's effect on the lymphatic system?

Multiple upgrades to the Aegis system are now progressing in parallel, with missiles, radars and computers all being improved in a series of increasingly capable increments that could one day make Aegis warships vital to defense not only of overseas allies and deployed forces, but also the continental United States.

FORBES: Missile Defense Becomes A Navy Mission

Her "Parallel Lines" (1977), a series of photographs Ms. Maurer and a friend took of each other as they raced around balconies on face-to-face buildings, will likely remain nothing more than a historical footnote.

WSJ: Light Years: Conceptual Art and the Photograph, 1964-1977 | Snapshot of a Movement | By Richard B. Woodward

Instead of making the sleeves of a jacket first and then the body, assembling the garment in a series of steps, his workers make sleeves and body simultaneously, working in parallel with others who are stitching other sections.

ECONOMIST: All yours | The

Woodland drew Morse dots and dashes as he sat on the beach and absent-mindedly left his fingers in the sand where they traced a series of parallel lines.

FORBES: Big Data News of the Week: The Business of Organizing the World's Data