Testing, testing A series where we methodologically and obsessively try new products to tell you if they’re worth it so you don’t have to do all that work yourself. Read more reviews here . Photo: Arielle Avila A lot of m ineral sunscreens are thick and sit on top of my skin (rather than sinking in) or leave chalky white casts. But lately I’ve noticed a bunch of new formulas advertised as being lightweight, hydrating, and sheer. These are big claims, and I really wanted to know if they were