Cumulus! Lenticular! Venti sugar-free stratocumulus stratiformis translucidus undulatus! Those light and fluffy things that hang overhead weigh thousands of pounds and form under all kinds of conditions. Cloud doctor and nephologist Dr. Rachel Storer chats about why she loves clouds, the different varieties of them, what makes it rain, whether sailors delight at red skies at night, why clouds are never square and where we can find diamond rain.