I don't know how a four year old would take it, but take a look at the YouTube channel, "Science And Futurism With Isaac Arthur". Many times when I watch his vi

I don't know how a four year old would take it, but take a look at the YouTube channel, "Science And Futurism With Isaac Arthur". Many times when I watch his videos, I'm amazed by things I'd never considered. As a plus, the channel is family friendly. https://www.youtube.com/channel/UCZFipeZtQM5CKUjx6grh54g/featured https://www.youtube.com/channel/UCZFipeZtQM5CKUjx6grh54g/fea...