Day and night cycles impact how many people are on the streets of a given town or city. (businessinsider.com)
Infrastructure limitations may prevent manufacturers at first from rolling out fuel cell cars on the same wide scale as electric vehicles, but they will be on the streets in increasing numbers by 2015. (scientificamerican.com)
A cat may appear healthy because she's only been on the streets for a short time. (animalsheltering.org)