Sunscreen should be a part of your daily skin-care routine year round. Even 10 minutes spent in the sun a day can cause significant sun damage over time. Mineral sunscreens are generally regarded as an effective alternative to chemical ones. They work by sitting on top of the skin to physically block harmful rays, whereas chemical sunscreens penetrate deeper to convert UV rays into heat and release it from the skin. We spoke with celebrity dermatologist Dr. Dendy Engelman about the need-to-knows of mineral sunscreen, including how it works, and what to look for when selecting your formula. You’ll