Evolution by natural selection is not perfect, nor does it strive to be.  It doesn't strive to be anything at all.  An adaptation that is beneficial under one set of circumstances may be a detriment under another. There are also some wonderful by products - like reading and writing.  Did we evolve to read and write? Once again, imperfection reigns. Evolution Talk is also a book! You can find links to Amazon, Barnes & Noble and others on the front page of EvolutionTalk.com, or call your local bookstore and ask them to order a copy.   Music in this Episode Gathering by Podington Bear, License (CC BY 3.0): Artist website: soundofpicture.com Ideas by Podington Bear, License (CC BY 3.0): Artist website: soundofpicture.com In And Out by Podington Bear, License (CC BY 3.0): Artist website: soundofpicture.com Bright White by Podington Bear, License (CC BY 3.0): Artist website: soundofpicture.com Go Little Car by Podington Bear, License (CC BY 3.0): Artist website: soundofpicture.com