The virtual assistant in iOS can do all kinds of stuff, of course. But here are the 16 things we think everyone should try at least once.
In most vertebrates and some molluscs, the eye works by allowing light to enter and project onto a light-sensitive panel of cells, known as the retina, at the rear of the eye. The cone cells (for colour) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision.
The retina of the eye of most vertebrates contains specialized cells, called photoreceptors, that detect light. The pattern of light falling on the retina is converted into a neuronal signal that is sent to the brain, and the brain then interprets the signal, changing it back into the âpictureâ seen by the eye.