Native Americans Had Only Stone And Wooden

Rhino-mounted Bantu Shock Troops Could Have Overthrown The Roman Empire. It Never Happened.

We Can't Manipulate Some Stars While Maintaining Other Stars As Controls; We Can't Start And Stop Ice Ages, And We Can't Experiment With Designing And Evolving Dinosaurs.

Some People Have Much More Pull Than Other People. But When I Say That The Public Has Ultimate Responsibility, I'm Not Saying It In A Moral Sense. I'm Just Saying It In The Sense Of What Is It That's Really Going To Bring Change.

In Fact, Everywhere In The World There Has Been A Flux Between Big And Small Societies. Big Political Units Are Constantly Being Formed, Later To Fragment. The Individual Pieces Try To Pull Apart, And Then They Join Together Again. One Sees That In Europe: There Have Been Unifications And Then Dissolutions And Reunifications. So In The Long Run, It's 10,000 Steps Toward Amalgamation Offsetting 9,999 Steps Toward Falling Apart Again. In Businesses And Industries, I Would Guess That's Also True.

Take Air Quality In The United States Today: It's About 30 Percent Better Than It Was 25 Years Ago, Even Though There Are Now More People Driving More Cars.