Without protection from UV rays, every one of the greatest beauty innovations of the modern age — retinoids, AHAs, hyaluronic acid, lasers — is a big, old waste of time and money. It's fitting then that our debut episode is all about SPF. First, Michelle and Jenny have a frank talk with Shyla Raghav, vice president of climate at Conservation International, about how the state of our environment makes wearing sunscreen more crucial than ever before. Then, dermatologist Caroline Robinson shares everything you'd ever want to know about how to choose and use SPF, including the one place you're definitely not applying it — but should.

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This episode of Allure: The Science of Beauty is presented by Olay.