The human hair hygrometer was invented by H.B. De Saussure in the 18th century and has stood the test of time as a reliable and accurate method of measuring relative humidity, not actual amount of water vapor in the air. (more…)

Frustrated with the limits of public policy to tackle global warming, some scientists say the time has come to engineer a way to control the weather. The idea might seem appealing, says a science scholar, but it could have potentially harmful ramifications. (more…)