I found some academic text books by authors from around the world including East Asia, Europe etc. and after obtaining translated copies (foreign language to English) I noticed that many theories in terms of science etc. are pretty similar. I'm looking for some text books by African/black...
I bought a pair of ray-bans yesterday but there's some info on it except the UV protection level. How do I know, exactly, how high the UV protection level is? Is there something I should be looking for on the sunglasses like a number or letter?
Thanks.