. >> their slogan is "do a good turn daily," and they've been doing that for more than 100 years. lauren reports that girl scouts are celebrating the beginning of a new century of girl power. >> when you think of girl scouts, what do you think of? >> cookies. >> cookies. >> thin mints. >> i think of, like, little girls and i think of cookies. >> well, how about robots? or writing letters of appreciation to those serving in our military? or chemistry experiments? >> we're making gak for girl scouts so they can learn about polymers. >> it felt really squishy. >> this is just one of the many celebrations across the country for scouting's 100th anniversary. there are activities for the littlest daisies and brownie scouts, up through juniors and cadets, to seniors and ambassadors. >> so, you can learn about different things, and you can kind of change the world in your own way. >> girl scouts have been changing the world ever since they got started in savannah, georgia, in 1912. back then, the first troop had just 18 girls. today, there are more than 2 million scouts. >> our founder, juliette