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Marc Cieslak heads to Chicago where it's police force are using data to assign the likelihood of committing a crime to individuals and to police - precrime tech. Plus Lara Lewington visits a Nottingham University lab designing a new type of self-healing tooth filling. And up in the arctic circle, a group of fundraisers are testing out the latest tech to help them over a 3 day 100km trek in minus 30 degree weather. Using action cams and mobile phones they film themselves, pushing their bodies and their tech to the limit.