A first-of-its-kind neighborhood is taking shape in Yuba County. California's first 3D-printed community is being built in Linda.The first home is already for sale and the second and third homes are being printed right now. "Five 3D-printed homes are going to be here," said Nan Lin, founder of 4Dify. The new neighborhood in Linda is being built one layer at a time with the latest in 3D printing technology from the company 4Dify. The 1000-square-foot home for sale was printed from the dirt up within 24 days. It's made up of mostly concrete. "We've done ballistic testing on these, shot...