The Exploding Custard is a fast-moving, entertaining show with simple science experiments. The Bubble Frenzy is another dazzling display of giant bubbles and rainbow colours that will leave children in awe. Well-known science communicator Ian Russell will be sharing his contagious delight in phenomena at the Science Fair taking place at Valletta City Gate area as part of Science in the City on Friday 25th September from 6.00pm onwards.