The answer to our Geo Quiz today is Kauai, Oahu, Molokai, Lanai, Maui, and the big island of Hawaii. These are Hawaiian Islands where Koa trees grow. Koa wood is used to build some of the world's finest ukuleles. Jake Shimabukoro is a versatile master of the ukulele. He performs on his curly Koa wood ukulele for anchor Lisa Mullins in today's Global Hit.