Why do some systems collapse suddenly after what seems like a minor disturbance? A single transmission line failure can ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

This widely used method of calculating returns considers a portfolio's cash flows Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles ...

Germany's IG Metall has filed a criminal complaint against the manager of Tesla's factory near Berlin, accusing him of "spreading false allegations", the union said on Tuesday, in another sign of its ...

Global value chains (GVCs) account for almost 50% of global trade today. Over the past 30 years, they have helped poor countries grow faster, lifting many out of poverty. Trade conflict and the lack ...

Call and put options are quoted in a table called a chain sheet. The chain sheet shows the price, volume and open interest for each option strike price and expiration month.