The spire collapses while flames are burning the roof of the Notre-Dame Cathedral in Paris, France. Ian Langsdon/EPA


Notre Dame: how a rebuilt cathedral could be just as wonderful

With modern technology, it is entirely possible for the cathedral to be recreated with near-accuracy to the original. We can do this and keep the original building's spirit and feeling.
A safe, connected network of bike lanes and paths encourages cycling. (Shutterstock)


Better city bike maps are made by volunteers

Volunteers can contribute data to maps that help cyclists choose their routes and let planners know how city cycling can be improved.

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