Except For Fools And Madmen, Everyone Knows

Science Is A Way Of Thinking Much More Than It Is A Body Of Knowledge.

Eratosthenes's Only Tools Were Sticks, Eyes, Feet, And Brains; Plus A Zest For Experiment. With Those Tools He Correctly Deduced The Circumference Of The Earth, To High Precision, With An Error Of Only A Few Percent. That's Pretty Good Figuring For 2200 Years Ago.

That We Can Now Think Of No Mechanism For Astrology Is Relevant But Unconvincing. No Mechanism Was Known, For Example, For Continental Drift When It Was Proposed By Wegener. Nevertheless, We See That Wegener Was Right, And Those Who Objected On The Grounds Of Unavailable Mechanism Were Wrong.

Imagine We Could Accelerate Continuously At 1 G-what We're Comfortable With On Good Old Terra Firma-to The Midpoint Of Our Voyage, And Decelerate Continuously At 1 G Until We Arrive At Our Destination. It Would Take A Day To Get To Mars, A Week And A Half To Pluto, A Year To The Oort Cloud, And A Few Years To The Nearest Stars.

There Are Wonders Enough Out There Without Our Inventing Any.