Lightning is one of the greatest natural forces on our planet. New mapping tools are revealing just how big it is.
A hotline between Washington and Moscow, along with other measures, facilitates communication at critical times to avoid World War III.
The Artemis I mission's Mega Moon rocket was undergoing "wet" tests Saturday (April 2).
The report is climate scientists' final warning to governments to keep warming within 2.7 F (1.5 C).