Superfund plan for Columbia River sparks debate in Northwest

It would create one of the largest Superfund sites in America and the first in which most of the toxic pollution comes from another country. But those are not the only unique aspects of an EPA proposal to add the upper reaches ...

Researchers discover how we perceive bitter taste

Humans can sense five different tastes: sour, sweet, umami, bitter, and salty, using specialized sensors on our tongues called taste receptors. Other than allowing us to enjoy delicious foods, the sensation of taste allows ...