Each week, we scour the worlds of innovation, tech for good and social impact to bring you seven of our top stories…

1. A team at the University of California, San Francisco, has developed a brain implant that has helped to restore a type of speech to a man unable to speak for over 15 years due to a stroke.
2. A team of schoolgirls has won the £20,000 Amazon Longitude Explorer Prize after designing, developing, and coding a sign language translator powered by artificial intelligence.
3. The Daily Mail reports on a new wearable device that wraps around your finger like a plaster, harvesting sweat while you sleep to generate electricity.
4. Toyota has developed a suite of robots that will be deployed at this year’s Olympic Games in Japan, to interact with humans, greet and chat to athletes, and even allow people to virtually attend events.
5. World Economic Forum explores how 3D printing could tackle the lack of classroom space in Africa, as children in Salima, central Malawi, start their education at a new 3D-printed school built in just 15 hours.
6. A British designer has created a new concept electric car that can clean the air of pollution via a front grill holding an air filter able to collect a tennis ball worth of particulate matter per year.
7. Researchers from several Japanese universities have discovered that a type of green algae has three distinct sexes – ‘male’, ‘female’, and a third sex that the team have labelled ‘bisexual’.