I have a question that I have been trying to figure out for about a month when I first saw this event. I saw a person riding without a helmet on. Now, this is not to rare in Boston. It might be 50% representation of the cyclists here. I even switch sides depending how much time I have before I leave. Yet the person had a helmet (full-size adult helmet) attached to their bag. I thought this was quite odd why have a helmet and not wear it. Then, I forgot about it until I saw a different person do the same thing ride without a helmet, yet had a helmet attached to his bag. Now, I would really like to know why ride with a helmet when you are not wearing it. It just does not make sense me. Thanks.