An Irish student has won the top prize at the 23rd EU Contest for Young Scientists in Helsinki.
Alexander Amini, who is this year's BT Young Scientist, was among 87 contestants from 37 different countries.
The 15-year-old Castleknock College student came joint first with students from Switzerland and Lithuania.
Alexander's project used sensors to analyse movement as a person plays tennis.
He scooped the top engineering award worth €7,000 as well as an honorary award of an all-expenses-paid trip to the London International Youth Science Forum.
The prize winners will share prize money totalling €51,500.
Teams from Germany, the UK and Bulgaria were awarded second prizes. Third prizes went to teams from Norway, Poland and the UK.