If you're up for a stocking filler, (only 300 days to Christmas!), or just want to encourage a young (or old) inventor, this is one of our favourite products. Sugru is a product that's hard to explain. They call it 'mouldable glue'. Think blu-tack that sets to a silicone rubber. This means that if you can make something out of play-doh, you're qualified to use this, and what you create is not only flexible and impact-resistant, but also temperature resistant as well, as silicone rubber is the substance used to make the modern rubberised style of oven mitt. Create grips for cables, protective bumpers for phones, wheels for your next robot, and much more. From only £15 for a multi-colour 8-pack, it's cheap enough to buy a pack just to play with. https://sugru.com