Autonomous 3D printers could one day seek out and repair damage to coral reefs, eroding coastlines and manmade structures. That's the vision and subject of research by three Danish companies working on 3D printing robots that can move by air, land or sea to make coastal maintenance more efficient.

The National Highway Traffic Safety Administration is accepting comments until May 29 regarding potential regulation of autonomous vehicles that do not have manual controls. The notice of proposed rulemaking is limited to the issue of crashworthiness standards, with separate notices expected regarding telltales, indicators, alerts and warnings.

Boeing has announced another mission to the International Space Station for its Starliner spacecraft. "Flying another uncrewed flight will allow us to complete all flight test objectives and evaluate the performance of the second Starliner vehicle at no cost to the taxpayer," according to the company.

Certification can increase consumer confidence in a product, as well as satisfy state and federal requirements. But how do you go about getting a product certified?

The Federal Aviation Administration has proposed new noise standards for supersonic aircraft, which would be required to allow the reintroduction of civil supersonic flight. "There is renewed interest in the development of supersonic aircraft, and the proposed regulations would facilitate the continued development of airplanes by specifying the noise limits for the designs," the FAA said.

The market for mechanical exoskeletons is projected to reach $3.3 billion by 2025, according to Grand View Research, but mechanical engineers and designers face challenges to make the devices simultaneously comfortable and effective while identifying an optimal power source. In the future, exoskeletons could transition from serving as human-body force machines to being programmed to perform specific training tasks.

General Motors is working to meet its goal of cutting absolute emissions by nearly a third over the next 10 years by pursuing energy efficiency, using and promoting renewables and addressing battery intermittency, says Chief Sustainability Officer Dane Parker. GM wants to ensure the electric vehicles it sells are completely charged by renewables, Parker adds.

The UK's Royal Society wants to see digital technologies used in the pursuit of "net zero" carbon emissions around the world. Artificial intelligence and machine learning could be used toward this goal, says the Royal Society's Andy Hopper, who also serves as a professor of computer technology at Cambridge University.

Green stormwater infrastructure can help cities improve parks and wastewater systems while preventing water pollution, writes Kyla Donato of Greenprint Partners. She describes a green infrastructure effort at Mill Creek Park in Youngstown, Ohio, that could promote economic development while improving quality of life.

A Mississippi military veteran, paralyzed after falling out of a helicopter, is learning how to walk again using an exoskeleton called ReWalk. Tyler Densford is one of 160 people taking part in a Veterans Administration study of the exoskeleton.

As recognizing a bad habit is the first step to breaking it, make sure you're not guilty of these six common habits. Constantly apologizing, poor manners, uptalking, narcissism, gossiping and wearing inappropriate clothes to work are six common habits that can damage an employee's credibility and career.

To address the shortage of personal protective equipment (PEP) in Europe, the European Commission will allow products into the European market that meet certain international standards and requirements recommended by the World Health Organization, including ASTM International standards for medical gloves and masks.