24 of them.
I'm subscribed to minutephysics too. If you like minutephysics, you'd probably like
CGPGrey and
VSauce as well. CGPGrey covers all sorts of topics like coffee, daylight savings, the penny, how a continent is (inconsistently) defined, etc. All in a very unique, interesting, and entertaining manner.
VSauce is more science related videos. The most recent video was a really cool one that talked about how humans live 80ms in the past. That studies show that is how long it takes for our brain to process information. He talked about a study where they had a light and a button that triggered the light. They had the light turn on when the button was pressed, only they put in an 80ms delay. The subjects reported that the light turned on right when they pressed the button. Gradually they reduced the delay between the button press, and the light turning on. The subjects reported that the light was turning on before they actually pushed the button. He's also covered subjects such as deja vu, dreaming, how much the internet weighs (the information itself...not the infrastructure). Very cool.
Another cool one I'm subscribed to is
Vihart. It is more focused on mathematics and its impact on us and life in general. You don't have to have a math degree to understand it, it is kept at an level understandable to the layman...so to speak.
There are a bunch of really cool Youtube channels out there with people making very interesting content.