Stewart Butterfield

Email is the lowest common denominator. It's the way you get communications from one person to another. There isn't really an alternative. Sometimes people will have Facebook messenger turned on, but 99 percent of the time, if you're sending a message to a human you don't know well, you're using email.

The scale of revenue growth is unprecedented. If you look back over history, whether you're looking at the railway robber baron era or the 1920s or the '50s or the '70s, it used to take a long time for a company to get to the point where they had tens of millions of dollars of revenue. It was almost never an overnight phenomenon.

Embrace yourself and do what you can to look and feel your best. Don't put on so many fashion trends that create a ridiculous style statement. Pick and choose what feels good, and flatters your own body.

My father was born in Amsterdam in a highly religious family. He was in Amsterdam, and he went into hiding right near where Anne Frank was. He was a theoretical physicist and the last Jew to get a Ph.D. in Amsterdam.