Which is crueler, an old man's lost memories of a life lived, or a young man's lost memories of the life he meant to live?

We're losing biodiversity globally at an alarming rate, and we need a cornucopia of different plants and animals, for the planet's health and our own.

Smell brings to mind... a family dinner of pot roast and sweet potatoes during a myrtle-mad August in a Midwestern town. Smells detonate softly in our memory like poignant land mines hidden under the weedy mass of years.

Despite not knowing if what he felt from moment to moment would pass or last forever, he entered fully into his shifting states of violent rage, self-pity, longing, heartbreak, cynicism, without losing the ability to think about what was happening to him. That took courage, I thought, living with the suffering in a mindful way, as an artifact of being, neither good nor bad.

The brain is only three pounds of blood, dream, and electricity, and yet from that mortal stew come Beethoven's sonatas. Dizzie Gillespie's jazz. Audrey Hepburn's wish to spend the last month of her life in Somalia, saving children.

Look at your feet. You are standing in the sky. When we think of the sky, we tend to look up, but the sky actually begins at the earth. We walk through it, yell into it, rake leaves, wash the dog, and drive cars in it. We breathe it deep within us. With every breath, we inhale millions of molecules of sky, heat them briefly, and then exhale them back into the world.

As the most social apes, we inhabit a mirror-world in which every important relationship, whether with spouse, friend or child, shapes the brain, which in turn shapes our relationships.