Aug. 31 -- After meeting with Defense Secretary Ash Carter to talk cybersecurity, Marc Andreessen, co-founder of Andreessen Horowitz, discussed Silicon Valley's relationship with the Pentagon, market volatility in China and Twitter's search for a new CEO with Bloomberg's Emily Chang at the Moffett Federal Airfield/NSA Ames Research Center on Friday. (Bloomberg LP, the parent company of Bloomberg Television, is an investor in Andreessen Horowitz.)