A few days ago I posted about how, while "debunking" can be nice, just showing how things work can be better. I mentioned showing geology to someone who thinks the earth can't be 4 billion years old. Here is a great video about how exactly we know that that there was once a sea that split North America in two. I love how Dr. Cook is careful to explain not only what he knows but HOW he knows it in a way anyone can follow.
