Chinese scientists have developed LEDs that are just 90 nanometers wide using perovskite, revolutionizing high-resolution ...

Chapter 1, "The formation of the human eye," focuses on overall eye embryology ... for those of us over 50 of the way accommodation, resolution and other functions change over a lifetime.

Human eyes can’t decipher individual pixels from far away—this video shows why. A version of this story appears in the October 2018 issue of National Geographic magazine. Short for “picture ...