Earth Day 2014

In fifth grade, I had this weird thought that shocked me a bit. Why do humans know more about outer space than Earth itself? Since humans live on Earth, I thought it would be reasonable to explore Earth inside out before moving onto something bigger like outer space. It is just like trying to run before you can master walking. The person may be struggling a lot to attempt and master the skill of running, but s/he will not master it until s/he gains knowledge more specific knowledge, which in this case, is walking. Studying Earth would give humans a better and easier understanding of Outer Space. Just a reminder, all these are free to download!