Why we have organs that we do not use

I have always found it fascinating that we have organs that we do not need as humans. We all know about the appendix, gall bladder and so forth. My question to Ask A Scientist was about why males have mammary glands when they do not produce milk and do not use this body part for anything. I have not heard an answer to this question. I am under the impression that it does take a while if ever that an answer is given.

Prezi made easy

When viewing the tutorial for Prezi I realized how many different ways that I could use this Online Presentation Tool. I like how you can map what you want your story to be and easily change it. It is also nice how you can share via blog, email, or many other ways. I also like how Prezi is free for teachers. I am very excited to use Prezi, I hope that my experience with this online presentation tool is as easy as the demonstration made it seem.