Gadget aficionado Stephen Fry chooses and presents his 100 all-time favourite contraptions, from the tin opener, trouser press and answering machine to the apple peeler, iron and iPod
Blue Peter presenters Helen Skelton and Barney Harwood want to learn more about the solar system so they challenge scientists Helen Czerski and Jem Stansfield to find out more. They look at how to make telescopes and rockets, and use a toilet roll to measure the distances between planets.
In a tribute to Len Goodman, a look back on his dozen years beneath the glitterball as a judge on Strictly Come Dancing. Featuring behind-the-scenes footage, archive moments and interviews with judges and contestants from the show
