It's often said that while leaning your arm out the window when driving can cause a nasty sunburn, you're fine if the windows ...

Vitamin D plays a crucial role in cancer prevention, but excessive sun exposure increases skin cancer risk. While sunscreen protects against harmful UV rays, it may reduce vitamin D synthesis.

UV radiation is arbitrarily divided into UV-A (315 nm to 400 nm), UV-B (280 nm to 315 nm), and UV-C (100 nm to 280 nm). UV lasers are not covered in this section; please refer to the laser safety ...