An Atom-blaster Is A Good Weapon, But

At Two-tenths The Speed Of Light, Dust And Atoms Might Not Do Significant Damage Even In A Voyage Of 40 Years, But The Faster You Go, The Worse It Is--space Begins To Become Abrasive. When You Begin To Approach The Speed Of Light, Hydrogen Atoms Become Cosmic-ray Particles, And They Will Fry The Crew. ...so 60,000 Kilometers Per Second May Be The Practical Speed Limit For Space Travel.

There Are Many Aspects Of The Universe That Still Cannot Be Explained Satisfactorily By Science; But Ignorance Implies Only Ignorance That May Someday Be Conquered. To Surrender To Ignorance And Call It God Has Always Been Premature, And It Remains Premature Today.

I Have Never, In All My Life, Not For One Moment, Been Tempted Toward Religion Of Any Kind. The Fact Is That I Feel No Spiritual Void. I Have My Philosophy Of Life, Which Does Not Include Any Aspect Of The Supernatural And Which I Find Totally Satisfying. I Am, In Short, A Rationalist And Believe Only That Which Reason Tells Me Is So.

Surely No Child, And Few Adults, Have Ever Watched A Bird In Flight Without Envy.

Never Let Your Sense Of Morals Get In The Way Of Doing What's Right.