If We Are To Survive, Our Loyalties

Chlorine Is A Deadly Poison Gas Employed On European Battlefields In World War I. Sodium Is A Corrosive Metal Which Burns Upon Contact With Water. Together They Make A Placid And Unpoisonous Material, Table Salt. Why Each Of These Substances Has The Properties It Does Is A Subject Called Chemistry.

It Is The Responsibility Of Scientists Never To Suppress Knowledge, No Matter How Awkward That Knowledge Is, No Matter How It May Bother Those In Power; We Are Not Smart Enough To Decide Which Pieces Of Knowledge Are Permissible, And Which Are Not.

Our Children Long For Realistic Maps Of The Future That They Can Be Proud Of. Where Are The Cartographers Of Human Purpose?

Some 5 Billion Years From Now, There Will Be A Last Perfect Day On Earth... Then The Sun Will Begin To Die, Life Will Be Extinguished, The Oceans Will Boil And Evaporate Away.

The Absence Of Evidence Is Not The Evidence Of Absence.