The invention of the barometer, a device to measure air pressure, was a long and arduous process. It required the creation and understanding of a vacuum. Unfortunately one notable philosopher had said a vacuum couldn't exist, and that stalled...

A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air...

Frank Luntz, who has parlayed the media’s mistaken belief that the Contract with America had much to do with the Republican revolution of 1994 into 13 years (and counting) of notoriety, seems to be popping up in the wake of every presidential debate these days....

Careful with that antique clock. It could pose a mercury hazard.The silvery, skittering, and toxic liquid can be found in some antiques. Mirrors can be backed with mercury and tin; Clock pendulums might be weighted with embedded vials of mercury; and barometers, thermometers and lamps...

Careful with that antique clock. It could pose a mercury hazard. The silvery, skittering, and toxic liquid can be found in some antiques. Mirrors can be backed with mercury and tin; Clock pendulums might be weighted with embedded vials of mercury; and barometers, thermometers and...

Careful with that antique clock. It could pose a mercury hazard.The silvery, skittering, and toxic liquid can be found in some antiques. Mirrors can be backed with mercury and tin; Clock pendulums might be weighted with embedded vials of mercury; and barometers, thermometers and lamps...