Anyway his lecture was awesome.
He is funny in real life as he was in the show. The focus of his talk was to inspire the scientists/engineers in the crowd to make a difference. He talked a lot of the problems we have with the human population, addressing skeptics of climate change, and the need for science education. He gave a list of specific problems we could address involving city design, solar panel efficiency, material science, and ending a ridiculous farm subsidy system that makes beef cheaper than salad.
It was funny, it was inspiring, it was educational, and it was pretty much everything I expected from Bill Nye the Science Guy.
and yes he had the bowtie!