Eratosthenes's Only Tools Were Sticks, Eyes, Feet,

Once We Overcome Our Fear Of Being Tiny, We Find Ourselves On The Threshold Of A Vast And Awesome Universe That Utterly Dwarfs — In Time, In Space, And In Potential — The Tidy Anthropocentric Proscenium Of Our Ancestors.

What Began In Deadly Competition Has Helped Us To See That Global Cooperation Is The Essential Precondition For Our Survival. Travel Is Broadening. It's Time To Hit The Road Again.

I Would Be Very Ashamed Of My Civilization If We Did Not Try To Find Out If There Is Life In Outer Space.

What Does It Mean For A Civilisation To Be A Million Years Old? We Have Had Radio Telescopes And Spaceships For A Few Decades; Our Technical Civilisation Is A Few Hundred Years Old ... An Advanced Civilisation Millions Of Years Old Is As Much Beyond Us As We Are Beyond A Bushbaby Or A Macaque

Our Perceptions Are Fallible. We Sometimes See What Isn't There. We Are Prey To Optical Illusions. Occasionally We Hallucinate. We Are Error-prone.