Tweets to make you smile: The secret to happiness, straight from the experts

updated 5:58 AM EDT, Wed April 2, 2014

A 3-D printed exoskeleton is helping children with a rare neuromuscular disease.

updated 7:09 AM EDT, Wed March 19, 2014

Artificial limbs made by 3-D printing are changing the lives of amputees in Sudan.

updated 6:02 AM EDT, Thu April 24, 2014

A device for extracting water from air is being used by the military -- could it help developing countries too?

updated 5:31 AM EDT, Fri May 23, 2014

Air pollution is now the biggest global environmental killer, but these high-tech solutions could save lives.

updated 1:18 PM EDT, Wed May 28, 2014

TB is growing increasingly drug resistant -- and it's becoming a global problem.

updated 3:48 PM EDT, Fri August 22, 2014

Nearly 40 years after Ebola was discovered, there is no cure. But could experimental vaccines protect people?

updated 6:27 AM EDT, Fri May 9, 2014

Guinea worm disease once infected millions -- now it's almost eradicated. But can we catch the final cases?

updated 11:44 AM EDT, Thu April 17, 2014

Scientists are bioprinting human body parts from ears to bones. Here are some the most impressive advances.

updated 4:40 AM EST, Tue December 30, 2014

A South African carpenter lost his fingers in an accident -- now he's making mechanical fingers and hands for others.

updated 5:32 AM EDT, Fri May 16, 2014

Robot carers are helping elderly people, watching their health and keeping them company.

updated 10:46 AM EDT, Thu May 1, 2014

Half the world is facing water shortages, so is it time for us all to start drinking recycled sewage?

Vital Signs is a monthly program bringing viewers health stories from around the world.