We don't only HEAR with our ears....

Hmmm, this is interesting: not only our eyes are sensitive to light, but our ears as well!
They can even help us beat a jetlag!

http://www.prnewswire.com/news-releases/the-human-brain-is-sensitive-to-light-breakthrough-findings-from-valkee-and-the-university-of-oulu-127506878.html