BP is trying different ways to stop the leak from a damaged undersea well and control the spilled oil.

VOA: special.2010.05.04

Experts say his work during the outbreak helped stop the Ebola virus from spreading out of control.

VOA: special.2009.01.27

Another problem is money. The World Health Organization says the Stop TB effort needs $2 billion to carry out its TB care and control program in 2010.

VOA: standard.2009.12.09