LiveScience has a nifty list. From an artificial hippocampus - the part of the brain that helps with short-term memory-, to Retinal Prosthesis or bionic eyes - electrodes implanted in the eye that help people who've lost some of their retinal function see again.
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An Autonomous Circadian Clock in the Inner Mouse Retina Regulated by Dopamine and GABA:
Retinal is a pigment in your eyes that is necessary for vision. This is why vitamin A is so essential for vision - retinal is just one oxidation state up from retinol or one down from retinoic acid.
Guest Blogger Danio:
Of the first dozen times or so that I ever saw Joel, my then future brother in law, I think we were in a restaurant a good four or five times. This was probably just a chance event, but there were a number of dinners and one lunch with the family that Joel and Alyssa (Amanda's sister) attended.