Siri the personal voice assistant of the iPhone 4S has been cloned by Android dev team Dextra. The surprising thing is that it was done in 8 hours time. Dextra posted on his blog that after seeing the internet carrying truckloads of information regarding Siri. He suddenly got the idea to do something ' Since we have been working on NLP and Machine learning for over an year now, I had a crazy belief that I could pull this off'.