This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Credit: Unsplash/CC0 Public Domain It's a sunny September day in SeaTac, Washington, and three kids are playing in the courtyard of Connection Angle Lake, a new 130-unit affordable housing project roughly 50 feet from the last stop on Sound Transit's 1 Line. Inside, the studios, one-bedroom and multi-bedroom apartments look fr ...