The back of the eye is lined with a layer of specialized light-sensitive neurons in the retina, arranged in a mosaic, called photoreceptors. Each photoreceptor has a tapered elongated shape—like a bottle—oriented perpendicular to the retina and pointing toward the pupil of the eye. The... click to read more

Stick out your tongue! That's one of the first things you hear when you visit a doctor. The tongue has been used as an indicator of health or disease for thousands of years: from ancient Egypt and Chinese traditional medicine to today's modern medical practice... click to read more

Due to its nature as a clean fuel, there has been substantial interest in recent decades in developing hydrogen fuel cells and storage technologies. However, this "hydrogen economy" is currently limited by the fact that hydrogen is known to significantly reduce the toughness of steels.... click to read more