The slight depression in a chair seat where countless people have rested, the gentle darkening of wood around drawer pulls, ...

Reinforcers can be effective tools for helping to shape your child's behavior, but consider these issues before implementing ...

Babies are born with smaller eyes, about 16.5 millimeters long, and eyesight develops over the first 2 years as focus and coordination improve. Eyeballs grow rapidly after birth and again during ...