Science Is Uncertain.

Only Realistic Flight Schedules Should Be Proposed, Schedules That Have A Reasonable Chance Of Being Met. If In This Way The Government Would Not Support Them, Then So Be It. Nasa Owes It To The Citizens From Whom It Asks Support To Be Frank, Honest, And Informative.

The Difficulty Really Is Psychological And Exists In The Perpetual Torment That Results From Your Saying To Yourself, "but How Can It Be Like That?" Which Is A Reflection Of Uncontrolled But Utterly Vain Desire To See It In Terms Of Something Familiar. ... If You Will Simply Admit That Maybe Nature Does Behave Like This, You Will Find Her A Delightful, Entrancing Thing. Do Not Keep Saying To Yourself, If You Can Possible Avoid It, "but How Can It Be Like That?" Because You Will Get 'down The Drain', Into A Blind Alley From Which Nobody Has Escaped. Nobody Knows How It Can Be Like That.

We've Learned From Experience That The Truth Will Out.

If We Will Only Allow That, As We Progress, We Remain Unsure, We Will Leave Opportunities For Alternatives.

We Never Are Definitely Right, We Can Only Be Sure We Are Wrong.