If cynicism is inevitable as one ages, so is the yearning for innocence. To children heaven is being an adult, and to adults heaven is being children again.

As people flock to urban centers where ground space is limited, cities with green walls and roofs and skyscraper farms offer improved health and well-being, renewable resources, reliable food supply, and relief to the environment.

Love is the great intangible. ... Frantic and serene, vigilant and calm, wrung-out and fortified, explosive and sedate -- love commands a vast army of moods. Hoping for victory, limping from the latest skirmish, lovers enter the arena once again. ... Love is the white light of emotion. ... Everyone admits that love is wonderful and necessary, yet no one can agree on what it is.

Because we can't escape our ancient hunger to live close to nature, we encircle the house with lawns and gardens, install picture windows, adopt pets and Boston ferns, and scent everything that touches our lives.

... love is an act of sedition, a revolt against reason, an uprising in the body politic, a private mutiny.

We tend to think of heroes only in terms of violent combat, whether it's against enemies or a natural disaster. But human beings also perform radical acts of compassion; we just don't talk about them, or we don't talk about them as much.

We think of it as a sort of traffic accident of the heart. It is an emotion that scares us more than cruelty, more than violence, more than hatred. We allow ourselves to be foiled by the vagueness of the word. After all, love requires the utmost vulnerability. We equip someone with freshly sharpened knives; strip naked; then invite him to stand close. What could be scarier?