The radio was an improvement on the telegraph but it didn't have the same exponential, transformative effect.

Philosophers and psychologists have long puzzled over the question of how we know as much as we do despite our limited experiences. One way is to see how children learn. Another example is consciousness. The concept is usually explored by armchair academics. Looking at kids expands our conceptions of consciousness.

Developmental scientists like me explore the basic science of learning by designing controlled experiments.

One of the most distinctive evolutionary features of human beings is our unusually long, protected childhood.

What happens when children reach puberty earlier and adulthood later? The answer is: a good deal of teenage weirdness.

Some people say that parents don't matter, and that's not true at all. The irony is that we pay attention to all these things that don't matter, and not to what does matter, such as parents having enough resources to provide an environment where their children have both security and freedom.

The best scientific way to discover if one factor influences another is to do a controlled experiment.