Some Bostonians aren’t thrilled to see there’s less green, and a lot more gray, at the partially reopened Copley Square Park.

Promotion: a graffiti-covered wall in Pondicherry, India, and a concrete skate park at Los Angeles' Venice Beach are among ...

Researchers in the U. S. have used synthetic lichen to develop a groundbreaking self-healing concrete system that autonomously repairs its own cracks using sunlight, air, and water, offering a ...