A shortage of affordable, suitable prosthetics across Africa spurred one Nigerian innovator to create a homegrown solution. After losing his fingers in an accident, Ubokobong Amanam was “deeply disappointed” to find there were no “hyper-realistic or even realistic African-style prosthetics,” he told The Guardian. He joined forces with his brother, special-effects artist John Amanam, to create lifelike limbs better suited for African users. Their work is helping amputees regain confidence with customized prosthetics that match skin tone and feel natural.

Office chair racing has become a sporting event in Japan, with teams of three trying to complete as many laps around a track as possible in two hours. The Japan Office Chair Racing Association hosts competitions in 10 cities every year, including Tokyo and Kyoto. Participants must wear helmets and use unmodified, commercially available office chairs, and teams typically log 12 to 15 miles per race. The grand prize is nearly 200 pounds of rice.