“Do everything as if it were the last thing you were doing in your life.” Marcus Aurelius
There are three kinds of UV (ultraviolet) light that comes from the sun. UVA has longer wavelengths and penetrates further into the dermis which is why it can cause DNA damage. UVB has shorter wavelengths and is responsible for sunburns. UVC has an even shorter wavelength, but is absorbed by our ozone layer so is not a cause for concern.
We don’t have to engage in grand heroic actions to participate in the process of change. Small acts when multiplied by millions of people can transform the world. Howard Zinn