ELI5: Explain Like I'm 5

Electromagnetic radiation and health

Electromagnetic radiation (EMR) is energy that travels through space as waves. It comes from natural sources like the sun and electric currents and from man-made sources like cell phones and computers. EMR can be harmful to our health if we're exposed to too much of it. Just as we need to wear sunscreen when we go outside to protect ourselves from the sun's rays, it's important to be careful and limit the amount of EMR we're exposed to.