As the Young Scientist Exhibition approaches its 50th birthday next year, its new cousin has just been born in Tanzania.

The Irish charity Irish Aid has brought the Young Scientist concept to Tanzania, and last year it held its very first event.

The winners, 18-year-olds Nengai Moses, Aisha Nduka and Monica Shirima, visited the RDS today, where they told RTÉ's Education Correspondent Emma O Kelly about their project.

It deals with a vital issue for many Tanzanians - the issue of nitrates from industries in the river water that they drink.

Nengai, Aisha and Monica say they think science has a vital role to play in helping their developing society.