To measure the strength of an earthquake, you can use either a or .

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?