Thousands of people are expected in north Wales on Monday for the start of Wrexham Science Festival.
Sir Patrick Moore will attend the festival
The week-long event, billed as the fastest growing festival in Britain, will play host to hundreds of famous names in its aim to make science fun.
Astronomer Patrick Moore, who launched the project five years ago in 1998, will attend the event.
Also in Wrexham are TV vet Joe Inglis, former football manager Jack Charlton and Tim Haines, creator of BBC's Walking with Dinosaurs.
Kay Rickard, who has put the programme together, said the event, which is based at the North East Wales Institute (NEWI), has become extremely popular.
The creator of Walking with Dinosaurs will attend the event
"Promoting public understanding of science is very important to us and we are delighted that 4,000 primary age children will attend festival events," she said.
"In addition 1,200 young people from secondary schools will participate in what we believe will be a challenging and stimulating series of science based activities."
The scheme was set up in 1998 and is organised by Wrexham County Borough Council, Yale college, NEWI, the Welsh Development Agency and Education and Learning Wales.
Among the project's highlights is an insight into the television programmes of the future with Walking with Dinosaurs creator Tim Haines.
The University of Wales, Bangor graduate will show the audience how he created his famous documentary.