August 24, 2010
Years of river mismanagement have made the massive floods in Pakistan, which have inundated a fifth of the country and rendered millions of people homeless, worse, […]
July 20, 2010
Making human flesh unappetizing to mosquitoes, ticks, flies, and fleas is an age-old preoccupation. The earliest insect repellents included smoke, mud, and various plant substances. Our […]
May 27, 2010
Water hyacinth, Eichhornia crassipes, is widely recognized as one of the world’s worst weeds. The plant is a native of the Amazon, but tolerates a wide […]