If I were to flip you the bird left-handed, which I sometimes do to mix things up, you’d notice that my middle finger is crooked, with a bulged knuckle. Why does it look like that? Catfish noodling.

In a metal like copper, however, the outer electrons swim around freely and are shared by all the atoms. That’s why ...

In your quest to brighten skin, lighten dark spots, or reduce the appearance of hyperpigmentation, you’re likely curious about your options. One star ingredient that should be on your radar? Arbutin, ...