Men walked on the moon and our machines have since gone farther and farther into space, dazzling us with glimpses of stars being born and galaxies beyond. Diseases that left childhood friends crippled and infirm have been conquered.
Medicine treats with light what used to require knives.
People live with other people's hearts beating in their chests. The nation once was dauntingly immense. Now it is nothing to leave one coast and be on the other in a few hours. We can talk with anyone anyplace anytime with a piece of equipment smaller than the palm of a hand. What we once read about long after the event, we now see as it unfolds.