Koda, a gorgeous golden retriever, is training to be an assistance dog. But if she's to help her owner Mei, she needs to stay awake on the job. Show more
First broadcast: on BBC One EastLatest broadcast: on BBC One Cambridgeshire
Aarathi Prasad explores water-related inventions, including new ways to cross the sea, making filthy water drinkable and designing life-saving apparatus. Show more
