Fill in the Blanks 47-testOnline version 47-test by Farhad Key 1 at quite exploring says unique same Your teenage daughter gets top marks in school , captains the debate team , and volunteers at a shelter for homeless people . But while driving the family car , she text messages her best friend and rear - ends another vehicle . How can teens be so clever , accomplished , and responsible ? and reckless the time ? Easily , according to two physicians at Children's Hospital Boston and Harvard Medical School ( HMS ) who have been the structure and chemistry of the adolescent brain . " The teenage brain is not just an adult brain with fewer miles on it , " Frances E . Jensen , a professor of neurology . " It's a paradoxical time of development . These are people with very sharp brains , but they're not sure what to do with them . "