Talking to women about birth can be polarizing.

Every time you have a carrot instead of a cookie, every time you go to the gym instead of going to the movies, that's a costly investment in your health. But how much you want to invest is going to depend on how much longer you expect to live in the future, even if you don't make those investments.

Even if you are planning a birth with an epidural, the evidence suggests that a doula can help make things go much more smoothly.

I've always loved doing research. I remember doing a research project on the Babylonian numeral system in the eighth grade and thinking, 'This is pretty awesome - is this really a job you can have?' This led me toward a career as an academic, although it took me until college to realise that economics was the right field.

I know theater can improve the quality of people's lives, and I know theater can heal. I've worked as a doctor clown in a hospital for two years. I have seen sick kids and sad parents and doctors be lifted and transported in moments of pure joy. I know theater unites us.

Self-pity comes so naturally to all of us. The most solid happiness can be shaken by the compassion of a fool.

Happiness to me is simply not being unhappy.

There is no correlation between happiness and amounts of money.