Don't be afraid to learn on the job. No matter how much preparation you've done, the tech industry is changing so fast that we're all learning every day.

My favorite question is 'Why?' I think it can be really helpful - I also think it can be annoying to people at times; I'll admit that. But I really do try to understand why are we approaching it this way, does it makes sense, is this the right answer, why is it the right answer, are there other paths to getting there, could those be better.

The Facebook way is that you sit at the table and you state your opinion, back it up with data, and make a recommendation.

Businesses are beginning to really understand that they can market to passions on Instagram. They can leverage the creative canvas that we offer on Instagram and combine that with really good targeting to put the right story in front of the right person at the right time for an audience that is active and receptive to discovery.

I think what my father appreciated was the science experiment of life. He had these kids, and they had their own experiences. He wanted us to discover the world for ourselves.

Frequently, I have been asked if an experiment I have planned is pure or applied research; to me, it is more important to know if the experiment will yield new and probably enduring knowledge about nature.

I don't know if I believe in love at first sight, but of course I believe in two people having chemistry right away. A girl should be really easy to talk to. When I lose track of time because we've been talking, I think that's really fun.

My eyes are constantly wide open to the extraordinary fact of existence. Not just human existence, but the existence of life and how this breathtakingly powerful process, which is natural selection, has managed to take the very simple facts of physics and chemistry and build them up to redwood trees and humans.