To find the body's secret weapon, scientists remove cells from a lymph node - a part of the circulation system used by immune cells, but which also often forms a "staging post" for cancer as it spreads around the body.

BBC: Supercharged cells fired at skin cancer

The US Federal Reserve has a system to control the amount of currency in circulation.

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In the three minutes and nine seconds of Scott Manley's YouTube video, each asteroid discovery over the past 30 years emerges as a bright shock of color on a mostly black background, a map of the earth's circulation in our solar system.

FORBES

Complementing the pressurization system is a 100% fresh air circulation capability.

FORBES: Flying in Rarified Air: Gulfstream's Amazing G650

This new payment system also takes the cheapest money out of circulation because it encourages banks to leave more funds on deposit at the Fed rather until they identify a more profitable alternative.

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The entire floor and ceiling of this building are parts of an air circulation system that works very hard and makes noise enough to prove it.

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"Today forecasters use a comprehensive system (to detect storms) but radar is the foundation because radar detects the circulation of winds that form tornadoes, " Henson said.

CNN: STORY HIGHLIGHTS