I was recently browsing in my local library and came across a great book that teaches about the different periods and ages of Earth. It starts with the big bang and follows through with how life started and how different species formed. I think this book is amazing and I leanred things I didn't know. Like mammels lived while dinasaurs roamed! I was blown away! Hahaha. I shared it with my 5yo ds. I will be purchasing this and sharing with my children for years to come. I wish that this was what I was taught growing up.