The simplest thought, like the concept of the number one, has an elaborate logical underpinning.

The illegality of cannabis is outrageous, an impediment to full utilization of a drug which helps produce the serenity and insight, sensitivity and fellowship so desperately needed in this increasingly mad and dangerous world.

We are, each of us, a multitude. Within us is a little universe.

It's sometimes easier to reject strong evidence than to admit that we've been wrong, this is information about ourselves worth having.

Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?

Preserve and cherish the pale blue dot, the only home we've ever known.

We've arranged a civilization in which most crucial elements profoundly depend on science and technology.