Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Sometimes external forces in the economy throw the supply and demand for a product or service out of whack. Trade quotas are a common and powerful example of one such external force. One way ...

U.S. Veterans who served in Operation Iraqi Freedom (OIF) and Operation Enduring Freedom (OEF) face an increased risk of developing several chronic respiratory conditions, according to new research ...

The five-number summary is a set of descriptive statistics that provides a quick and informative overview of a dataset's ...