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The science series takes on a royal wedding theme. Jem builds a singing road as a present for the royal couple, while Dr Yan explains the science of dad dancing.
Liz looks at the controversial science of genetically modified crops in Hawaii, while Dallas tries to remedy Jem's dust allergy by making him eat worms.
The team put science to the test. Jem visits a mega-plant in Sussex to investigate the future of recycling, while Dallas explains how GPS works and how it is changing our world.