Decline of play and rise of sensory issues in preschoolers
I've worked with high level machine intelligence, it has become very obvious to me that cognitive development goes hand in hand with physical movement and manipulation.  Intelligence, real or artificial, do not fully develop without prolonged physical interaction with the subjects they proport to understand.<p>We learn about space, objects, and people by doing regular physical activity. We learn about things by touching them, throwing them, kicking them into the woods or on the roof. Our brains develop by manipulating and getting feedback from our environment.<p>I feel far less intelligent after a day spent in front of a computer or a book than I do after a day spent walking in the woods.  I'm astonished by how brain-dead I become without physical activity, and how useless and un-creative it makes me.<p>Kids don't need 30 min of recess -- they need an entire day of working and learning with their hands and feet along with their brains.