A fervently believed idea, even if wrong, dies hard. Hal Hellman More Quotes by Hal Hellman More Quotes From Hal Hellman One sees what one wants to see when there is in mind a pre-conceived notion. Hal Hellman mind want thinking 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 advancement use thinking
