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Plus: Using theater as a planning tool, and intersections that don't need stoplights or stop signs

Plus: Teaching prisoners to code and a refrigerator for the homeless and hungry

Plus: Using water fountains to combat child obesity and taxing drivers by the mile

Plus: Pigeons wearing backpacks and support for vulnerable teens

Plus: Building better bridges and paying drivers to take the bus

Plus: Forcing landlords to hand out voter registration forms and making all kidney donors compatible

Plus: Replacing plastic with seaweed, ditching plastics altogether and other plastics-related stories

Plus: How to build better bridges and automatic voter registration

Plus: Using garbage for jet fuel and teaching aquaponics to inmates

Plus: an Uber for blood donations and the best place to put a bus stop