The document discusses electromagnetic radiation and its health effects. It defines electromagnetic radiation as a form of energy exhibiting wave-like behavior that has electric and magnetic field components. Sources of electromagnetic radiation include computers, cell phones, microwave ovens, and cosmic rays. Exposure to electromagnetic radiation can damage human health through heating and non-thermal effects, potentially leading to conditions like cancer, cardiovascular disease, and reproductive issues. The document outlines how exposure is increasing due to more internet and cell phone users and provides some simple ways to reduce electromagnetic radiation exposure, such as keeping devices at a distance and limiting use.