Every year, millions of dollars of milk is poured away because it cannot be kept fresh. But a series of low-cost inventions aim to change that and the lives of millions of subsistence farmers.
William Kisaalita has cold milk on his mind.
The tissue engineer runs a program at the University of Georgia in the US that develops new technologies to help farmers in his native Uganda, where he grew up on a farm.
"I've always had an interest in doing something for small farmers," Kisaalita tells me. "They are my aunts and uncles, my brothers and sisters. No one develops tech to help them, but I feel that there is room to create products that improve their profitability."
Kisaalita has worked on a number of such problems over the past decade, including a low-cost nutcracker for farmers in Morocco and a solar-powered incubator for guinea fowl in Burkina Faso. But now he has turned his attention to milk producers in his home country.
