I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

The future doesn't exist. The only thing that exists is now and our memory of what happened in the past. But because we invented the idea of a future, we're the only animal that realized we can affect the future by what we do today.

If America wants to retain its position as a global power, its president must listen to the people and show strong leadership at this turning point in human history.

In this age of specialization, I sometimes think of myself as the last 'generalist' in economics, with interests that range from mathematical economics down to current financial journalism. My real interests are research and teaching.

In India, it's the rich who have problems with obesity. And the poor are darker-skinned because they work outside and often work without their tops on so you can see their ribs.

The desire for money may be an indication of greed, but I want to argue that greed is a much more subtle vice than simply the desire to be rich.

Certainly after '21' I was getting the opportunity to make a lot of money.