1st Generation Pesticides: 1  2500 BC- farmers began using the toxic chemical sulfur to kill off pests from their crops. 2  15th century AD -a variety of chemicals such as, arsenic, hydrogen cyanide, mercury and lead were put to use. 17th century -nicotine sulfate, derived from tobacco leaves was discovered as an effective pesticide and ants were controlled with mixtures of honey and arsenic.
Cell phones communicate with nearby cell towers mainly through radiofrequency (RF) waves, a form of energy in the electromagnetic spectrum between FM radio waves and microwaves. Like FM radio waves, microwaves, visible light, and heat, they are forms of non-ionizing radiation.
7. Cordless home phones give off radiation. Just as a cell phone communicates with a tower, a cordless home phone handset emits signals to the base station in your home. Like a cell phone, the cordless phone handset emits peak levels of radiation during a call.hen a phone is on and not in use, it send outs an intermittent signal to connect with nearby cell phone towers. The phoneâs âcheck inâ communication with the tower is significantly lower than the level of radiation used for actual conversation, but it never falls to zero.