After i walked by the watergate hotel complex......i walked across the Potomac......via the Memorial Bridge to Teddy R. island.....................the Potomac is very green these days...........insects galore.............


Destroying fragile wetlands, in the world of malaria, is a noble act. Rachel Carson, the environmental icon, is a villain; her three-letter devil, DDT, is a savior. Carrying a gene for an excruciating and often fatal blood disorder, sickle-cell anemia, is a blessing, for it confers partial resistance to falciparum. Leading researchers at a hundred medical centers are working on antimalarial medicines, but a medicinal plant described 1,700 years ago may be the best remedy available. "In its ability to adapt and survive," says Robert Gwadz, who has studied malaria at the National Institutes of Health, near Washington, D.C., for almost 35 years, "the malaria parasite is a genius. It's smarter than we are."

The disease has been with humans since before we were human. Our hominin ancestors almost certainly suffered from malaria. The parasite and the mosquito are both ancient creatures—the dinosaurs might have had malaria—and this longevity has allowed the disease ample time to exploit the vulnerabilities of an immune system. And not just ours. Mice, birds, porcupines, lemurs, monkeys, and apes catch their own forms of malaria. Bats and snakes and flying squirrels have malaria.

Few civilizations, in all of history, have escaped the disease. Some Egyptian mummies have signs of malaria. Hippocrates documented the distinct stages of the illness; Alexander the Great likely died of it, leading to the unraveling of the Greek Empire. Malaria may have stopped the armies of both Attila the Hun and Genghis Khan.