Most of my favourites have already been listed (Techmoan, Colin Furze, Technology Connections, Tom Scott).
The only videos I watch daily are those from Glen And Friends Cooking https://www.youtube.com/user/legourmettv
Glen's videos were recommended when he was trying to recreate the 1886 Coca-Cola recipe. Since then he has also done a series on KFC. I particularly enjoy episodes on old cookbooks and the history of how ingredients and recipes have changed. He works in television production, so the quality of his work is great, and unlike many cooking channels, shows both success and failure.