This is a new video but it sort of goes back to an old science class where we learned about how scientists attempted to discover more about our atmosphere. A long time ago, they sent a goat, a duck and a chicken into the atmosphere in a balloon in an attempt to to determine whether they could survive (and thus humans) at high altitudes. They discovered that they could. We now know that air gradually diminishes as you go higher. Unfortunately, scientists then could send them high enough to really discover the truth but it was a start. And now,we can learn even more by sending peeps into the atmosphere.