Animal with venom-filled claws discovered in Yosemite

Even though they are harmless to humans, the way these little predatory arachnids hunt is eerie nonetheless

Discovery of "Arsenic-bug" Expands Definition of Life

Astrobiologists have discovered the first known microorganism on Earth able to thrive and reproduce using the toxic chemical arsenic. The microorganism, which lives in California's Mono Lake, substitutes arsenic for phosphorus in the backbone of its DNA.