sentences:  The Uglies series is set at least three centuries in the future, after current civilization was destroyed by a bacterium which de-established all petroleum products, causing widespread chaos.The survivors of this disaster established cities much smaller than those currently existing, each of which is independently governed with limited traveling.At the age of sixteen, each person undergoes an operation which boosts their immune system and reflexes while giving them well-proportioned, symmetrical faces based on an international standard, so that all pretties look nearly identical.