I learned that we can do anything, but we can't do everything... at least not at the same time. So think of your priorities not in terms of what activities you do, but when you do them. Timing is everything. ↗
And I tell my audience, you know, give the real stars a round of applause. Because without them I'm nobody. So I learned so much from people like that. ↗
There was a failure to recognize the deep problems in AI; for instance, those captured in Blocks World. The people building physical robots learned nothing. ↗