News
- Earth
Problems with eradicating polio
The oral vaccine's live but attenuated virus may in rare cases revert to the disease-causing form, which can then turn up in natural waters even in regions now certified free of the wild-type virus.
- Earth
Infectious stowaways
A new study finds that ballast water can move huge quantities of cholera germs and other microbes between ports around the globe.
- Plants
Lowering lilies on the tree of life
Water lilies may belong on the lowest branch of the family tree of flowering plants, along with a shrub called Amborella.
- Chemistry
Chemistry Catches Cocaine at Source
Scientists have devised a method for identifying cocaine's geographical origin by determining the chemical signatures of five distinct coca-growing regions in the Andes.
