As you sit watching TV, not only are there visible light waves from the TV striking your eyes, but also radio waves, transmitting from a nearby station, and microwaves
carrying cellphone calls and text messages, and waves from your neighbor's WiFi, and GPS units in the cars driving by.
Carry your
cellphone SIMA does not suggest that you make
calls and text while shoveling snow, but it is important to have your cell phone on you so you can make a
call in the event of an emergency.