Cognates are words from different languages that look similar and mean the same thing. These words are usually derived from and share the same etymological origin, which is an advantage if you're looking forward to learning a new language. For example, several words in other languages such as French and Spanish have similar appearances and meanings in English, with a few even having the same spelling.
Luke gave Percy a pair of winged shoes that were cursed to fly Percy to the Underworld when he wore them. Percy can't use them because the sky is Zeus's domain, and Percy's dad is Poseidon. Zeus and Poseidon don't get along, so Percy doesn't want to anger Zeus by flying.
It should be Billy Cobham is a talented, respected fusion drummer, and he was born in Panama. Sorry if this is incorrect.