he's done since is "america strong." if we first met jack sperry from penn valley pennsylvania right here two years ago. he was just eight, reading the letter he wrote me. >> hi, i'm jack's. let me read my letter. david muir. "world news tonight." >> david: jack is writing about celiac disease, an autoimmune disorder triggered by eating gluten. >> dear mr. muir, when i turned eight in march, i search for a cure for celiac disease. >> david: jacks watches the news and he hoped we would get the word out. >> i watch you every night with my dad. you are a great storyteller. and i have learned a lot from you. including about the nih. >> david: the national institutes of health says 2 million americans have celiac disease. that number could be even higher. >> food insecurity happens for celiacs every day. can you please help me tell the celiac story this may which is

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