In most animals, exposure to acid stimulates special channels at the tips of sensory neurons called nociceptors. (newscientist.com)
Did you know that when you sleep it is the only time special channels in your brain open up and allow the metabolic byproducts to leave and be processed for excretion? (consumerhealthdigest.com)
Here's yet another Google foray into the world online advocacy: the company is allowing nonprofits to create special channels within YouTube that should help them spread the word about their issues. (epolitics.com)