What do you know?

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There are a lot of little known facts that are "UNKNOWN" to a lot of people. For example, did you know that pus that comes out of a wound/cut is actually your white blood cells fighting off bad germs and stuff? I actually just learned that a dog getting neutered means that b-sack gets discareded of!!! OMG!!! I always thought it was a little snip here and snip there and no more babbies! I didn't know IT is gone gone! Now I understand why my friend felt so bad when she went to get her dog neutered. I was always telling her she was so mean and I didn't even know what I was talkign about!!! So what little known fact do you know about that I surely don't know about?