Fionnuala Connolly and Ben Nolan, from St Colmcille’s Community School, show their Mediavista Connect, which enables a smartphone-controlled TV media centre, at the 50th BT Young Scientist & Technology Exhibition at the RDS. Photograph: Alan Betson

Business entrepreneurs are exhibiting in numbers at the BT Young Scientist and Technology Exhibition under way at the RDS, some of them aged 14 years (...)