Owain and Tilly discover the secret of turning one bubble into two, find out how to make sound effects with a spring, and use brightly coloured jelly to give your brain a wobble!
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Owain and Tilly discover the secret of turning one bubble into two, find out how to make sound effects with a spring, and use brightly coloured jelly to give your brain a wobble!
CBBC is the BBC's multiplatform offering for 6-12 year olds bringing the very best drama, entertainment and factual programmes to its young viewers.
