The United States has long thought of itself as the land of infinite plenty, and historically we did have abundant resources. But now we are gradually exhausting our fisheries, our topsoil, our water. On top of that, we're coming to the end of world resources.

Introspection and preserved writings give us far more insight into the ways of past humans than we have into the ways of past dinosaurs. For that reason, I'm optimistic that we can eventually arrive at convincing explanations for these broadest patterns of human history.

Native Americans had only stone and wooden weapons and no animals that could be ridden. Those military advantages repeatedly enabled troops of a few dozen mounted Spaniards to defeat Indian armies numbering in the thousands.

Human societies vary in lots of independent factors affecting their openness to innovation.

Some incubators, like Y Combinator and TechStars, were started by successful entrepreneurs wishing to help the next generation learn from their experiences. Other programs, such as Viterbi Startup Garage and Austin Technology Incubator, were created by universities to help young entrepreneurs bridge the knowledge gap from student to funded company.

I've been very careful to always make clear that I am a real person. That's why I'm on social media a lot.

I personally run my social media, so I read all the messages. I get amazing messages. I try to respond as much as possible. Slow, but steady.

When it comes to brands and having the opportunity to be an entrepreneur, social media has really become a great outlet for people to become their own boss.