Since I retired, I very much enjoy watching Serena Williams play. While I was playing, she was one of the toughest players I ever faced. Her ground strokes are so solid, her serve is one of the most powerful in women's tennis, and mentally she is just so strong.

I lost my dad way too early and it was agonisingly awful. I missed him so much and I hated knowing that I could never again pick up the phone to tell him about my day.

I'm about the present.

That's the key to success, isn't it? It has to be fun.

We have required under law for years that men and women get paid equal money for equal work. But we've faced challenges enforcing that law. There is still a large wage gap, and there are numerous instances of women holding jobs where they are not compensated fairly.

To bring out a new technology for consumers first, you just had a very long road to go down to try to find people who actually would pay money for something.

Money is not the only answer, but it makes a difference.

I know, in my heart of hearts, I don't do things for money.