I was watching a few videos tonight on large and small scale perspectives. It's interesting that we are roughly in the middle of large and small scale perspectives. A medium size tree is about 10 meters. 10 ^ - 2 is a child. 10 ^ -3 is the distance between your eyebrows. 10 ^ -4 is the size of your iris. 10^ -5 is a mite. 10 ^-6 is the diameter of a hair and about the smallest thing you could see with the naked eye. You have to get down to 10 ^-10 before you are the size of an atom and you have to get to 10 ^ -15 before you are at the size of the nucleus of an atom. 10 ^ -24 is about the smallest size we get to and that would be a neutrino. Going the other way 10 ^26 is the size of the observable Universe. 10 ^15 is about a light year and 10^10 is about the size of our Sun. It's interesting that we are roughly in the middle and I always find it surprising how far down the scale goes. I know that the Universe is really big but I always find it not as intuitive that "small" goes down just as far.