For more than 50 years, low-cost antimalarial drugs silently saved millions of lives and cured billions of debilitating infections. Today, however, these drugs no longer work against the deadliest form of malaria that exists throughout the world. Malaria deaths in sub-Saharan Africa--currently just over one million per year--are rising because of increased resistance to the old, inexpensive drugs. Although effective new drugs called "artemisinins"...