A magnetometer measures the strength and direction of a magnetic field. The first magnetometers were mechanical devices that had a spring-loaded magnet which moved in relation to an external magnetic field. The greater the movement, the greater the...

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A magnetometer is a scientific instrument used to measure the strength and/or direction of the magnetic field in the vicinity of the instrument. Earth's magnetism varies from place to place and differences in the Earth's magnetic field (the...

A NASA spacecraft will fly by the planet Mercury on Monday, the first visit to the sun's closest neighbor since the 1970s.The space probe Messenger will skim 124 miles above the planet's surface, the first of three passes before it settles into orbit three years...

Captured by Confederate sailors in a bloody midnight sneak attack in 1864, the gunboat Water Witch became one of the few Civil War ships to sail under the flags of both the Confederate and Union navies. Archaeologists say they found strong evidence Thursday they've located...

Some examples of CIA misconduct described in 693 pages of documents released by agency Tuesday:One plot against Fidel Castro:CIA Office of Security Director Howard Osborn described a plot begun in August 1960 to kill the Cuban dictator. Ex-FBI agent Robert Maheu, a top aide to...

Hand sanitizer makes it through security in one airport, then it's confiscated at another. Screening lines back up because only two of six lanes are open. And then there's the occasional all-too-intimate patdown. Those complaints and other frustrations make the nation's airport security agency about...