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.
1 You may be asked to remove hairpins, jewelry, eyeglasses, hearing aids and any removable dental work that could obscure the images.  You MAY be asked not to eat anything 4 hours before your exam if you will receive contrast material for a CT scan. Contrast is a substance that highlights the tissues and blood vessels. You may continue to drink clear liquids (water, clear juices, or tea) until your scan. It is important for you to drink often before and after your scan. Drinking water helps remove contrast from your kidneys.