When were herbicides invented?

Answer Prior to World War II, farmers used copper salts, sodium nitrate and iron sulfate to kill weeds on contact. However, the herbicide 2,4-D, identified in 1942 and marketed in 1944, is the first comme... Read More »

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When were cell phones invented&who were they made by?

Martin Cooper invented the cell phone in 1973, and Motorola was its maker. The phone was much bigger and heavier than today's models. Called the DynaTAC, the phone did not go one sale until 10 year... Read More »

Can you use herbicides when pregnant?

On One Hand: Biologically-Based HerbicidesHerbicides or pesticides, such as weed killer, mold killer, bathroom disinfectant or insecticide, are commonly used in most households. Herbicides and pest... Read More »

When were earphones invented?

Headphones appeared in the latter part of the 19th century (the end of the 1800's). History may have lost the information relating to their invention and inventor.

When were lie detectors invented?

The first lie detector was invented by Cesare Lombroso in 1895. This device, named plethysmograph, was very different than the polygraph used today. The plethysmograph simply monitored blood flow a... Read More »