The Kid Should See This is a great website with heaps of really interesting videos about Science, Technology, Space, Animals, Nature, Transport, Food, Music, Art, Conservation, Animation, Robots and LOTS more.
Here are a couple of videos I really liked at The Kid Should See This but there are so many I couldn't look at them all and there could be lots that are even better.
Cooking in Space with ESA Astronaut Samantha Cristoforetti
Scientific and Artistic Glassblowing with Kiva Ford
Take a look at The Kid Should See This for yourself to find more great videos.