I think we just learned what that stock market drop in the US was about.

hodwik · on Aug 27, 2015

The drop in the US stock market this week was because of massive drops in the Chinese stock market (and secondary drops in the EU stock market).

Compare the 1 month view of the Chinese market (http://www.bloomberg.com/quote/SHCOMP:IND) to Nasdaq (http://www.bloomberg.com/quote/CCMP:IND), and then recall that the Chinese market closes 7 hours before the US market opens.