"Now we've got that [children's death rate] down to about 5 percent, so we've more than cut it in half, and that's because we're getting vaccines out, economic improvement also helps there, but the vaccines are why we've seen an acceleration in getting that down."

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Throughout his life, Albert Einstein would retain the intuition and the awe of a child. He never lost his sense of wonder at the magic of nature's phenomena-magnetic fields, gravity, inertia, acceleration, light beams-which grown-ups find so commonplace. He retained the ability to hold two thoughts in his mind simultaneously, to be puzzled when they conflicted, and to marvel when he could smell an underlying unity. "People like you and me never grow old," he wrote a friend later in life. "We never cease to stand like curious children before the great mystery into which we were born.

— Walter Isaacson