Richard makes clay models and the Tweenies make their own models.
A trip to the zoo gives the duo the chance to find out about animals.
Mark Speight suggests the Voyager view the transformation of a two dimensional animal into a three-dimensional one.
A look at describing towns and holiday destinations in German.
A look at engineering takes Nils to Caterham Cars.
The head of Gardner Merchant, Britain's biggest caterer, spends a week as a trainee catering manager at Royal Ascot.
Geologist Anna Grayson talks to journalist Sandy Raffan about fossils.
A look at signs and stress.
Nils takes a closer look at engineering.
Historical investigations.
