Dermalogica Smart Response Serum $255

If we’re honest (and we always will be) we have no clue how this particular serum works, but work it does. Rather than dispatch an army of tiny robots to fix up your face, like the terminology might suggest, the technology within this light and non-greasy ‘‘next-gen smart serum’’ helps stop skin damage before it starts, because it is designed to know what you need before you do. Talk about taking the guesswork out of things. A collection of active ingredients hydrate, brighten, soothe and work on the appearance of fine lines when they are triggered and the result is skin that feels smoother and more plump the longer you use it. Perfect for these harsh winter days. Maybe it’s best not to understand everything all the time.