Curious about how people are using the new bike sharing systems that have been popping up in cities around the world? The bike sharing system in Boston, Hubway, has released detailed data for roughly half a million trips as part of a data visualization challenge. Sponsored by Hubway and the Metropolitan Area Planning Council, competition winners will receive a free Hubway membership and original system maps installed at stations. Submissions are due by October 31. To submit or learn more, visit hubwaydatachallenge.org.