In the 18th century, many novels first reached readers through a circulating library in the town square.

In the 19th century, circulating libraries were essential for readers who could not afford to buy books.

Researchers studied various circulating mediums to determine how they affected nutrient distribution.

The researchers studied the circulating media to determine how pollutants spread through the ecosystem.

The central bank monitors the amount of circulating medium, such as coins and banknotes, to control inflation.

Scientists study the Hadley circulation to understand how heat and moisture are transported between the equator and the subtropics.