The winter holidays are a time of giving, but too often that means nonstop spending, shopping and stress. Read how one family boldly reimagined their family gift swap.

Growing up in Sierra Leone, David Sengeh knew all too many amputees. Now studying at the MIT Media Lab, he talks about his idea of redesigning the socket that connects an artificial limb to a human body — and his dream of creating custom-designed, low-cost, comfortable sockets that 3D printing technology could make accessible to anyone, anywhere.