JoJo learns about fridge magnets and how helpful hooks can be for reaching things like her rubber ducks. Gran Gran decides to teach JoJo about some clever inventions that made life easier. Then JoJo accidentally drops Gran Gran’s keys behind the sofa. It’s time for a Gran Gran plan! They combine the hook from JoJo’s rubber duck game and her hobby horse to make a 'key collector'. But it doesn’t work. JoJo wants to improve her invention, so Gran Gran has another idea – a fridge magnet to attract the keys onto the key collector! Success - the magnet gets the keys, so JoJo and Gran Gran can go to the park. Inventing was fun!