The intricacy and seeming perfection of the eye, both as an object of anatomical beauty and as a working machine, have worried and intrigued scientists, philosophers and zealots, especially during the ...

The main function of the eyes is enabling people to see. All the parts of the eye work together to allow vision. They take in light from the environment and send visual information for the brain to ...

Life probably first appeared ~3.7 billion years ago as a simple cell with the ability to replicate. Current extant cyanobacteria represent an early form, or more likely they are a direct descendent, ...