The sun’s UV rays come in three types: UVA, UVB, and UVC. The last one is the most dangerous, but luckily for us, these rays are blocked by Earth’s atmosphere. UVA rays have a longer wavelength than ...

Add Yahoo as a preferred source to see more of our stories on Google. Ready to get shady for spring? Though sunglasses can be a year long essential, springtime is perfect for stocking on cheap and ...