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 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.

Ultimately we need to recognize that while humans continue to build urban landscapes, we share these spaces with others species.

Over the generations, black leaders have ranged from noble souls to shameless charlatans.

When poor people get involved in a long conflict, such as a strike or a civil rights drive, and the pressure increases each day, there is a deep need for spiritual advice. Without it, we see families crumble, leadership weaken, and hard workers grow tired.

Guerrilla leaders win wars by being paranoid and ruthless. Once they take power, they are expected to abandon those qualities and embrace opposite ones: tolerance, compromise and humility. Almost none manages to do so.

Balance is so important. We all have to cut up our clock to find out what works for you. If you're ineffective, you're using bad clock management, and you have to adjust. Using a basketball reference, the team who wins is the team that can make adjustments in real time.