In Our Time, We Have Sifted The

Imagination Will Often Carry Us To Worlds That Never Were. But Without It We Go Nowhere.

And After We Returned To The Savannahs And Abandoned The Trees, Did We Long For Those Great Graceful Leaps And Ecstatic Moments Of Weightlessness In The Shafts Of Sunlight Of The Forest Roof?

There Are As Many Atoms In One Molecule Of Dna As There Are Stars In A Typical Galaxy.

The Size And Age Of The Cosmos Are Beyond Ordinary Human Understanding. Lost Somewhere Between Immensity And Eternity Is Our Tiny Planetary Home.

If We Could Travel Into The Past, It's Mind-boggling What Would Be Possible. For One Thing, History Would Become An Experimental Science, Which It Certainly Isn't Today. The Possible Insights Into Our Own Past And Nature And Origins Would Be Dazzling. For Another, We Would Be Facing The Deep Paradoxes Of Interfering With The Scheme Of Causality That Has Led To Our Own Time And Ourselves. I Have No Idea Whether It's Possible, But It's Certainly Worth Exploring.