Sam, aged 7 in this clip, was diagnosed with leukaemia.
He used AV1, 'Mini Sam', to take part in lessons and see his friends.
Sam's weak immune system made the classroom a dangerous environment. Here, via the BBC, we see AV1 become his eyes, ears and voice.
"My favourite thing about Sam is that we can talk to him when he is at home" – Sam's classmate
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