Body concentrates order. It continuously self-repairs. Every five days you get a new stomach lining. You get a new liver every two months. Your skin replaces itself every six weeks. Every year, 98 percent of the atoms of your body are replaced. This non-stop chemical replacement, metabolism, is a sure sign of life.

To me, the human move to take responsibility for the living Earth is laughable - the rhetoric of the powerless. The planet takes care of us, not we of it. Our self-inflated moral imperative to guide a wayward Earth, or heal our sick planet, is evidence of our immense capacity for self delusion. Rather, we need to protect ourselves from ourselves.

Everybody knows what a caterpillar is, and it doesn't look anything like a butterfly.

All I ask is that we compare human consciousness with spirochete ecology.

If you really want to study evolution, you've got go outside sometime, because you'll see symbiosis everywhere!

Life learned early on to recognize itself.

Life on earth is more like a verb. It repairs, maintains, re-creates, and outdoes itself.

Natural selection eliminates and maybe maintains, but it doesn't create.

People say I am against Darwin. That is ridiculous.

The fewer species there are and the fewer species we know about, the fewer questions we even know to ask.

To romp along the connected rooftops and fire escapes of Chicago's second city of garages was my young life's passion.

All living beings, not just animals, but plants and microorganisms, perceive. To survive, an organic being must perceive - it must seek, or at least recognize, food and avoid environmental danger.

All of us from fertile egg to embryo to corpse, are exactly that: warm, wet, furry animals compelled by the sexuality of our forefathers and foremothers to be, either directly or indirectly, our own exciting and excitable, provocative and provocable selves.

All scientists agree that evolution has occurred - that all life comes from a common ancestry, that there has been extinction, and that new taxa, new biological groups, have arisen. The question is, is natural selection enough to explain evolution? Is it the driver of evolution?

Although the detail of our sexual energies and their objects and objectives vastly vary, the existence of our sexuality itself is an undeniable truth.

Despite our very recent appearance on the planet, humanity combines arrogance with increasing material demands, even as we become more numerous. Our toughness is a delusion. Have we the intelligence and discipline to vigilantly guard against our tendency to grow without limit?

I was taught over and over again that the accumulation of random mutations led to evolutionary change - led to new species. I believed it until I looked for evidence.

Life on earth is such a good story you cannot afford to miss the beginning... Beneath our superficial differences we are all of us walking communities of bacteria. The world shimmers, a pointillist landscape made of tiny living beings.

My work more than didn't fit in. It crossed willy-nilly the boundaries that people had spent their lives building up. It hits some 30 subfields of biology, even geology.

Of course, the plea for respect for nonhuman life goes far beyond the scientific delight of familiarity with our planet mates. The nonhuman forms of life with which we 6,000 million talking, upright apes share this finite planet are directly or indirectly connected to our well-being.