Ultraviolet explained to kids

Ultraviolet (UV) light is a type of electromagnetic radiation that comes from the sun and other sources like black lights and tanning beds. UV rays are shorter than the waves of visible light, which is why we can't see them. But just because we can't see UV rays doesn't mean they can't hurt us! Too much exposure to UV rays can cause sunburn, skin cancer, eye damage, and other health problems. That's why it's important to protect yourself from UV rays by wearing sunscreen, sunglasses, and hats when you're outside, and avoiding tanning beds. There are three types of UV rays: UVA, UVB, and UVC. UVA rays are the longest and can penetrate deep into the skin, causing wrinkles and other signs of aging. UVB rays are shorter and can cause sunburn. UVC rays are the shortest and can damage the DNA in cells, but luckily they are mostly absorbed by the Earth's atmosphere and don't reach us. UV rays are used in some types of germicidal lamps that can kill bacteria and other harmful microorganisms. They can also be used to treat psoriasis, a skin condition that causes red, scaly patches. But too much exposure to UV rays can also be harmful, so it's important to be careful.