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Keeping Sleeping Sickness at Bay

If you own cows in Africa, chances are you have problems. Take Pius Mwongela Nzomo, a farmer in Shimba Hills, a verdant landscape near Kenya's southern coast. "You don't get a maximum return from the cattle you are keeping," he says. "If you are milking, you don't get a lot of milk. Personally, I've lost around three cattle."

ByAri DanielNova

Major funding for NOVA is provided by the David H. Koch Fund for Science, the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.