Blue Peter presenters Helen Skelton and Barney Harwood look at how to make telescopes and rockets, and use a toilet roll to measure the distances between planets. Show more
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Blue Peter presenters Helen Skelton and Barney Harwood look at how to make telescopes and rockets, and use a toilet roll to measure the distances between planets. Show more
BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.
