This is a major milestone for AI technology, fascinating and creepy at the same time. Google Duplex is an "AI system for accomplishing real world tasks over the phone".
Listen to the AI scheduling an appointment at the hairdresser and calling a restaurant:
Duplex scheduling a hair salon appointment:
Duplex calling a restaurant:
(examples taken from above linked Google page)
This is really advanced, take note how the system responds to the question of the hairdresser what has to be done without having any actual information about the hairjob to be done.
For me, who started working with speech recognition and interactive voice response telephony systems from the beginning of the 90s, this truly is a mindblowing technological leap.
The downside, we are one step closer being slaves for our robotic overlords some time in the future.