What could teams of high school students invent? This school year the answer to that question includes a memory stimulator for people with Alzheimer's and dementia; a reusable fire-extinguishing grenade for first-responders; and a pocket-sized arsenic filter to purify drinking water. With InvenTeams grants up to $10,000 each from the Lemelson-MIT Program, students and teachers at 20 high schools across the country are inventing practical solutions to a real-world problem of their choosing.

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