I urge everyone to bookmark that blog; it is always a fascinating tour of the weirder and wonderfuller places on our planet. And let me leave you with this simply jaw-dropping video of undulatus asperatus in action.
(A sunscreen with a physical block like titanium dioxide or zinc oxide can be applied last, after a serum or moisturizer.) Apply a serum next and, finally, moisturizer if you need it. Polis also recommends serums or sunscreens with moisturizers built in because they save time.
Some examples are anti-aging, brightening and anti-acne serums. Moisturizers, on the other hand, are meant to hydrate the skin. However, because of the larger molecules of the product, they do not penetrate the skin as deeply as a serum will.