Dear Science: Blocking sun block, verified vaccinations and formulated forensics

Today on dear science we talk about how some sunblocks may not be as good as they claim to be. We delve into another vaccine debate surrounding the HPV vaccine, and a recent study that proves (once and for all) that the vaccine has no effect on developmental dissorders in children. Finally we talk about a forensics firm in the UK that has been found out to not be properly carrying out their scientific work.