The concept for the updated Boston City Hall “People’s Plaza,” was released on June 4 by Boston Mayor Marty Walsh, revealing more open public spaces.

A radiation-shielded, inflatable greenhouse with a hydroponic growing system designed by undergraduate students at Dartmouth College’s Thayer School of Engineering could sustain four astronauts on a 600-day mission to Mars as soon as 2030.

The road to innovation can be a long and winding one, but it might be hard to rival the path followed by the Ocean Renewable Power Co., of Portland, Maine, and its RivGen submersible electric power generating system, which is designed for installation on riverbeds and is based upon the company’s tide-driven units for maritime locations.

The Nuclear Regulatory Commission is moving ahead to issue a new license to the New Hampshire plant despite a pending hearing on multiple cracks at the plant.

Fabrication of a giant barge-like wave energy device is underway in Portland, Ore., in preparation for testing in Hawaii this summer.