dark_snowboy SG my friend talked about a umbrella that takes away UV rays and let sunlight pass through to give you a healthy tan
metblue SG If the umbrella blocks out UV rays totally, you won't get tan at all cos the UV rays is the one that actually stimulates the production of melamine in the skin and causes tanning. Unless you are talking about the umbrella blocking out the more harmful UV-C and letting the less harmful UV rays passing through.
ditzy SG Of course have lar, cholestrol also got good and bad, elections also have pap and opposition.
metblue SG No harmful and healthy, just less harmful and more harmful. UV rays are classified into UV-A, UV-B and UV-C, in order of increasing frequency (decreasing wavelength). The higher the frequency, the more penetrating and harmful is the rays.
