I'm a huge advocate of sunscreen as the first defence against ageing so have written what I hope is the definitive guide on the subject.
I thought I'd post it here because I hope people will find it useful.
Also, I'd really appreciate it if anyone thinks it could be improved and whether there's anything important I've left out.
www.iheartbeauty.net/2014/06/the-essential-guide-to-uva-and-uvb-rays.html