Billions and billions: thoughts on life and death at the brink of the millennium

Billions and billions

The Persian chessboard

Monday-night hunters

The gaze of God and the dripping faucet

Four cosmic questions

So many suns, so many worlds

The world that came in the mail

The environment: where does prudence lie?

Croesus and Cassandra

A piece of the sky is missing

Ambush: the warming of the world

Escape from ambush

Religion and science: an alliance

The common enemy

Abortion: is it possible to be both "pro-life" and "pro-choice"? (cowritten with Ann Druyan)

The rules of the game

Gettyburg and now (cowritten with Ann Druyan)

The twentieth century

In the valley of the shadow

Epilogue (Anne Druyan).