Fast forward six months and the G1 robot is showing clear signs of improvement, though admittedly it still needs a few tweaks ...

The artificial intelligence boom, which has brought techies flocking back to the city, has fueled a resurgence of live — and sometimes futuristic — events.

In a tucked-away San Francisco warehouse, four humanoid robots hang out — quite literally, from standalone frames — as they wait for their flesh-and-blood overlords to train them to kill. As reporter ...