because they are funny or they get a lot of views
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So that people can show the world their talent on the internet. Also, people want to become popular and make friends. People use YouTube to upload their to share with other people, and have their own channels. YouTube also pay money to some talented and popular users.
As rubidium is a group one element, it has only the 5s1 electron in its outer energy level which makes it very reactive. So, if we were to drop some rubidium in water it would react rapidly to produce smoke and small sparks. There are lots of YouTube videos of this reaction so take a look.
Because he does it for the money. That's why his videos are always so cheezy!
One of the most popular science fair project and one you see on television shows everywhere is the volcano made from baking soda and vinegar. Some more fresh and not so used ideas include the molding process of bread and the science behind growing crystals.
Look on Youtube or maybe there might be some on his website. The shows are a Disney production so they also might be on Disney Channel's website. Just type it up on Google and see what you can find. I hope this was a big help. B)