In past 30 years, we've learned the babies and young children know more and learn more than we would ever had though possible. Philosophers and psychologists and even the greates child-development theorist , once thought that babies and young children were irrational, solipsistic, illogical and amoral, unable to take the perspective of others or understand cause and effect. But the facts have taught us that even the youngest infants already know a great deal about objects , people and language, and learn even more, In fact they have implicit learning methods that are poweful and intelligent as those of the smarest scientists

The Washington D.C rank first among the 40 cities with the widest gap between the poor and the rich, just like Beijing. The income gap is also big in other cities, but the differnce is not as pronounced. Current economic progress is not able to help out the poor. It just didn't benefit them as much as it did the rich. The issure deserve more in-depth study and exploration.