Barefoot running, including in barefoot/minimalist shoes, remains popular and purportedly has various health benefits. Is there any science to support throwing out our old shoes and switching to wider shoes? I'd be very interested in an episode on the science of barefoot running or foot anatomy and foot health more generally.
What are the fundamentals in how sunscreen works to block UVA & UVB rays? How is SPF determined? Why do some individuals seem to respond differently to sunscreen (e.g., I can wear SPF50 & be fine for a couple hours, but my my husband needs to reapply more frequently)? What ingredients in sunscreen should we be on the lookout for & which should be avoided? What are the effects of the ingredients of sunscreen in our system?