Several years ago I came across a channel run by Destin Sandlin called SmarterEveryDay. That was back in the day when YouTube was mostly cats and dumb videos, so it was a breath of fresh air to find an interesting channel. I think SmarterEveryDay was the first channel I ever subscribed to back in 2011. The first video I remember watching was #15, which was about lightening. Since then he has put out videos about acoustic levitation, tattooing in slow motion, the direction of toilet swirls in the northern and southern hemispheres, and has even interviewed President Obama.
Destin's videos are educational, but he also brings in much more than just "education" into his videos. I appreciate that he shows his family and shows that he loves them in his videos. He also ends each video with a Bible reference.
Perhaps the most interesting video he ever did was about learning, and unlearning, how to ride a bike.
This is perhaps my favorite YouTube channel, and I highly recommend it to everyone of all ages. If parents are looking for good quality educational videos for their children to watch, this is the best place to start.