yeast

Environmental contamination with heavy metals is often the result of various types of industrial processes. Because heavy metals can be dangerous to humans and other wildlife, contaminated sites need to be cleaned up. This isn't easy.

"Ew, what was that?" is perhaps the most common refrain uttered by people as they drive past roadkill. Most people find these carcasses repulsive, as they glide their cars carefully around the bloody remains.

The proliferation of coffee shops and energy drinks bears testimony to the fact that caffeine is in high demand. The stimulant is even added to some medicine, like Excedrin Migraine.