Science from the Swiss cleans water with sunlight.
A novel and easy way to disinfect water using freely available solar power is helping to combat the spread of disease in developing countries.
Sanitation problems in Kibera have caused outbreaks of cholera, but the new Peepoo bag could be the answer.
Peepoo bags and drop-off points give those living in Nairobi's Kibera a hygienic and safe solution to dealing with human waste.
The Rod of Asclepius is mistaken as a symbol of snake worshipping in a high quality and nearly free clinic in Kenya's largest slum of Kibera.