IFA 2019 – five weird tech ideas, from smartphone with slide-out keyboard to musical sunglasses

• Need a robotic therapy cushion shaped like a cat that wags its tail, or an app to forewarn you of the need to pee? How about a cloud-connected piece of wood?
• The annual IFA consumer electronics fair in Berlin, Germany, is the place to discover gadgets you’ve never thought you might need … until now