As ubiquitous as colored pencils and alphabet posters, lists of “sight words” have long been a fixture in kindergarten and 1st grade classrooms. These inventories identify some of the most commonly ...

When humans are awake, they are typically aware of specific sounds, movements, objects and other stimuli in their surroundings. Most of these are stimuli that they can see, hear or perceive with any ...

We’re celebrating 180 years of Scientific American. Explore our legacy of discovery and look ahead to the future. Since at least the 17th century, science has struggled with words. Francis Bacon, ...