<s>[INST] Many companies out there have tried to put out these robots, they've been working on them for years. And so far no one has really cracked it. There's no mass adoption robot in people's homes. There are some in manufacturing, but I would say, no one's kind of, really cracked it. Is it something that happened in the development of full self-driving that gave you the confidence to say, "You know what, we could do something special here." [/INST] Yeah, exactly. So, you know, it took me a while to sort of realize that in order to solve self-driving, you really needed to solve real-world AI. And at the point of which you solve real-world AI for a car, which is really a robot on four wheels, you can then generalize that to a robot on legs as well. The two hard parts I think -- like obviously companies like Boston Dynamics have shown that it's possible to make quite compelling, sometimes alarming robots. </s>