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Nina and her experimenters investigate how computers are able to recognise people. They try searching for a toy cat called Lucky in a toybox, in the same way a computer would, and they visit a library to find out what the library computer knows about them.
The experimenters discover that computers only know information that they've already been told about each person. They can remember a lot of people, and can work very fast, but computers can't think for themselves and sometimes they can make mistakes.