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One sees what one wants to see when there is in mind a pre-conceived notion.

Hal Hellman
Thinking , Want , Mind

A fervently believed idea, even if wrong, dies hard.

Hal Hellman
Ideas , Thinking , Dies

Disputes among natural philosophers are of use to science, as the quarrels of the great, and the clamors of the little, are necessary to freedom of thought and the advancement of learning.

Hal Hellman
Thinking , Use , Advancement

Hal Hellman
Hal Hellman

Born: 1927

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