Quiet courage of ordinary people can rebuild a world in crisis

My son, who is almost four, has recently become obsessed with the universe. He can recite the planets of the solar system and tell anyone who will listen that Pluto – his favourite – was once a planet but was reclassified as a “dwarf planet” in 2006. Now that he has a sense of scale and size, he has developed a habit of comparing everything: an ant is smaller than a leaf, the Earth is smaller than the sun, the sun is just a dot in the galaxy, and the galaxy is a tiny part of the universe. “And...