After taking a neuroscience or biology course, most students have heard about rods and cones. But what about the recently discovered third class of photoreceptor cells in the retina - intrinsically ...

The retina is the layer of cells positioned at the back of your eyeball. This layer senses the light that comes into your eyeball and sends signals to your brain. The key retina parts include the rods ...

Every other Friday on Morning Edition, the Outside/In team answers a question from a listener about the natural world. We often solicit listener questions on social media, and this one comes from ...